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Metallogenic epoch and genesis of the gold deposits in Jiaodong Peninsula, Eastern china: a regional review

Progress in Natural Science:Materials International 2007年第2期17卷 138-143页

作者： YANG Liqiang, DENG Jun, GE Liangsheng, WANG Qingfei, ZHANG Jing, GAO Bangfei, JIANG Shaoqing and XU Hao ( State key laboratory of {2.logical Processes and Mineral Resources, china university of {2.sciences, beijing 100083. china key laboratory of lithosphere tectonics and {12. technology of ministry of education, china university of {2.sciences, beijing 100083. china) [a]State key laboratory of {2.logical Processes and Mineral Resources China University of Geosciences Beijing China [b]key laboratory of {2. tectonics and lithoprobing technology of ministry of education China University of Geosciences Beijing China

Gold deposits are characterized by multi-sources, superimposition, large scale and temporal-spatial concentration in Jiaodong Peninsula, Eastern china. In this paper, we review the history and the development of the study on metallogenic chronology and genesis of gold deposits, summarize the main features of superimposed metallogenesis, provide evidence of the Mesozoic complex metallogenic system, and point out some problems for further research of Jiaodong gold deposit cluster from a regional view. Although gold deposits are different in genetic types, ore-forming materials and geological settings, our research indicates that the accumulation and emplacement of the ore-forming materials are temporally-spatially concentrated on a large scale, and the main metallogenic epoch of Jiaodong gold deposits was concentrated in Mesozoic. Metallogenic chronology and geological-geochemical data indicate that there are two periods of gold mineralizations occurred in 130-110 Ma and 90-80 Ma respectively in Jiaodong ore cluster. The gold deposit cluster results from the superimposition of the polygenetic mineralization, and further study is needed to investigate the formation and evolution of the Mesozoic complex metallogenic system.

关键词： superimposed metallogenic system Mesozoic Jiaodong ore cluster.

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Transport network and flow mechanism of shallow ore-bearing magma in Tongling ore cluster area

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Science china Earth sciences 2006年第4期49卷 397-407页

作者： DENG Jun1,2. WANG Qingfei1,2., HUANG Dinghua3 , WAN Li4, YANG Liqiang1,2.& GAO Bangfei1,2.1. State key laboratory of {2.logical Processes and Mineral Resources, china university of {2.sciences, beijing 100083. china 2. key laboratory of lithosphere tectonics and lithoprobing technology of ministry of education, china university of {2.- sciences, beijing 100083. china 3. Faculty of Earth sciences, china university of {2.sciences, Wuhan 430074, china 4. School of Mathematics and Information Science, Guangzhou university, Guangzhou 510405, china 1. State key laboratory of {2.logical Processes and Mineral Resources China University of Geosciences Beijing 100083 China 2. key laboratory of lithosphere tectonics and lithoprobing technology of ministry of education China University of Geosciences Beijing 100083 China 3. Faculty of Earth sciences China University of Geosciences Wuhan 430074 China 4. School of Mathematics and Information Science Guangzhou University Guangzhou 510405 China

Abundant studies revealed that shallow intrusions of the Yanshanian epoch resulted in the mass mineralization of the Tongling region. Various evidences showed there existed a concealed magma chamber at ?10 km depth in the middle part of this region during Yanshanian epoch, from which the ore-forming magma was generated and then transported to the superficial layer. Yet the transport network and flow mechanism of the shallow ore-bearing magma, the key problem associ- ated with ore-forming process, was relatively little focused on. Integrate analysis of structural me- chanics, statistical fractal and geological facts suggested that NE trending high-angle fold-related thrust faults and the tessellated basement ones served as the main pathways for the shallow magma’s transporting, moreover, the saddle void spaces among adjacent strata in the folds upon this fault system provided the place for magma’s emplacement. So the folds in the upper part and faults in the lower part of the upper crust constituted the fluid’s transport and emplacement network. During the deformation of geologic body with multi-layer structure, the layers in the upper part tended to fold when received the jacking stress from the lower part, while the lower one inclined to fault undergoing loads of the upper part. And the producing probability of this structure assemblage was highly in- creased in the condition, such as in the Tongling area, that the mechanic rigidity of the lower layers was stronger than that of the upper ones. For the pre-existence of fluid-conducting network, the top magma with high volatile in the magma chamber transported rapidly to the superficial layer in dyking pattern, located in the void spaces of folds, filled and reconstructed them. The sudden drop of pres- sure caused the fluid unmixing from the magma and mass ore-forming elements concentration. Pulse activity of the dyking may be the principal reason why magmatic bodies in the Tongling area were spatially-temporally con

关键词： Tongling, structural network, magma intrusion, fractal, dyke.

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Progress in researching into the transition of the Mesozoic tectonic systems in southeast china

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Progress in Natural Science:Materials International 2006年第6期16卷 563-572页

作者： YU Xinqi, WU Ganguo, ZHANG Da, ZHANG Xiangxin, DI Yongjun, ZANG Wenshuan, WANG Qunfeng and HUANG Huojian (State key laboratory of {2.logical Processes and Mineral Resources, china university of {2.sciences, beijing 100083. china key laboratory of lithosphere tectonics and {12. technology of ministry of education, china university of {2.sciences, beijing 100083. china) [a] State key laboratory of {2.logical Processes and Mineral Resources Chine University of Geosciences Beijing China [b] key laboratory of {2. tectonics and lithoprobing technology of ministry of education China University of Geosciences Beijing China

This paper presents the latest progress made on the research of Mesozoic tectonic system transition from the E-W paleo-Tethyan tectonic domain into NE-NNE western Pacific domain in southeast china. Tectonism of the west Pacific domain began at middle Jurassic (J2. and formed a set of NE-trending structures, non-coaxially overprinting on E-trending tectonic belts which may be early and coevally produced by the paleo-Tethyan domain. Thus began the tectonic domain transition from the E-trending paleo-Tethyan to the NE-trending Pacific and fully finished at the early Cretaceous. The eastern Nanling area was a junction zone of the transition at middle Jurassic (J2.,and ever since the junction zone might obliquely migrate to the coastal region, where is the east part of this study area. To the north of the Nanling area, the Ganjiang Fault Zone was the boundary between two tectonic domains. Corresponding to the transition of tectonic system, the geodynamics of SE china changed from a compressional system to an extensional system, which continued until the end of Mesozoic-Tertiary.

关键词： transition of tectonic system non-coaxial overprint obliquely migrate Mesozoic paleo-Tethyan tectonic domain west Pacific tectonic domain southeast china.

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Research advances in the Mesozoic tectonic regimes during the formation of Jiaodong ore cluster area

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Progress in Natural Science:Materials International 2006年第8期16卷 777-784页

作者： DENG Jun, YANG Liqiang, GE Liangsheng, WANG Qingfei, ZHANG Jing, GAO Bangfei, ZHOU Yinghua and JIANG Shaoqing (State key laboratory of {2.logical Processes and Mineral Resources, china university of {2.sciences, beijing 100083. china key laboratory of lithosphere tectonics and {12. technology of ministry of education, china university of {2.sciences, beijing 100083. china) [a]State key laboratory of {2.logical Processes and Mineral Resources China University of Geosciences Beijing China [b]key laboratory of {2. tectonics and lithoprobing technology of ministry of education China University of Geosciences Beijing China

Based on research advances of the tectonic regime in Jiaodong ore cluster area and the related tectonic regime transformation in Mesozoic era in the eastern region of North china, in this paper, we first summarize some key problems required to be studied further on. Then we suggest an approach to dealing with these problems. It is known that the gold deposits in Jiaodong ore cluster area, which are of different mineralization styles, spatial distributions and {2.logical settings, might be as a result from one or more {2.logic events in Mesozoic. Till now, this kind of research on the temporal evolution and spatial migration sequence, especially on the {2.dynamic mechanism of the above events, is far from sufficient. Moreover, quantitatively describing the action mode and the temporal-spatial framework of tectonic dynamic regimes and formulating the relative contribution of every tectonic dynamic regime for the metallogensis are still challenges to the {2.logists studying on the formation of Jiaodong ore cluster area. According to the interpretation of the regional tectonic analysis, the structural dynamics, the observation and the exploration of the mineralization network, we propose a {2.logical-physical-chemical model with some constraints originated from the comprehensive analysis. We then use this model to simulate the coupled processes of the structural deformation, thermal transport, fluid flow and the chemical reaction. The obtained results indicate that the model is efficient in further analyzing the temporal-spatial evolutional trail of the tectonic regime in Jiaodong ore cluster area and in further understanding the nature of the mass metallogensis.

关键词： tectonic regime Mesozoic era Jiaodong ore cluster area genesis metallogenic system.

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Late Mesozoic metamorphic core complexes: new constraints on lithosphere thinning in North china

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Progress in Natural Science:Materials International 2006年第6期16卷 633-638页

作者： LIU Junlai, GUAN Huimei, JI Mo and HU Ling (State key laboratory of {2.logical Processes and Mineral Resources, china university of {2.sciences, and key laboratory of lithosphere tectonics and lithoprobing {12. of ministry of education, china university of {2.sciences, beijing 100083. china) [a] State key laboratory of {2.logical Processes and mineral Resources China University of Geosciences Key Laboratory of Lithosphere Tectonics Beijing China [b] lithoprobing technology of {2. of education China university of Geosciences Beijing China

Metamorphic core complexes (mcc’s) are among the most prominent structural styles of lithosphere extension and thinning during late Mesozoic in North china. In this paper, the {2.metrical, kinematic and age characteristics of some of the mcc’s, e.g. Liaonan, Waziyu (Yiwulushan), Yunmengshan, etc., are discussed. Some common characteristics, such as kinematic polarity, {2.metric asymmetry, occurrence over a time span, scattered and isolated distribution, and progressive development, can provide direct constraints on the regional lithosphere extension and thinning in North china, which does not favor the prevailing plume model, a general de-lamination model or extensional collapse of overthickened orogenic crust. We argue that several aspects, such as the kinematic polarity at depths during lithosphere extension, gradual break-up of lithosphere plate, relationship between magmatism and regional extension, and coeval activity of mcc’s and Tan Lu fault, should be taken into consideration when constructing a more reasonable model for lithosphere extension and thinning in North china.

关键词： North china late Mesozoic metamorphic core complex lithosphere extension and thinning.

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Macro-and microscopic mechanical behaviour of flow of coal samples experimentally deformed at high temperatures and pressures

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Chinese Science Bulletin 2005年第S1期50卷 59-66页

作者： LIU Junlai , YANG Guang & MA Rui State key laboratory of {2.logical Processes and Mineral Resources, china university of {2.sciences, beijing 100083. china key laboratory of lithosphere tectonics and {12. technology of ministry of education, china university of {2.sciences, beijing 100083. china College of Earth sciences, Jilin university, Changchun 130061, china china Univ geosci State Key Lab Geol Proc & Mineral Resources Beijing 100083 Peoples R China china Univ geosci Minist Educ Key Lab Lithosphere Tecton & Lithoprobing Technol Beijing 100083 Peoples R China Jilin Univ Coll Earth Sci Changchun 130061 Peoples R China

Coal samples from Qinshui Basin, Shanxi, china are experimentally deformed at temperatures and confining pressures of 2.0 - 500℃and 2.0 - 500 Mpa, strain rate of 0.5×10-5/s and total strain of 10%. The vitrinite reflectance of the coal samples varies from 3.04 to 1.79. It is shown that the strengths of the deformed samples change obviously with coeval increasing temperatures and pressures (T/P). At the experimental range of T/P, the effects of increasing temperature predominate over that of increasing pressure. Microstructural analysis indicates a brittle to ductile transition under experimental T/P conditions from 2.0 to 300℃, and 2.0 to 300Mpa. Brittle deformation microstruc-tures include macroscopic fracture zones and penetrative fracture associations. Elongation, undulose or irregular extinction, deformation lamellae and dynamic recrystallization of grains are the main ductile deformation microstructures. The variation of deformation mechanisms of the experimentally deformed coal samples is related to both the components of coals and T/P conditions. At low T/P, fractures occur in both inertinite and vitrinite of the samples. At higher T/P, crystalline plastic deformations are observed in the inertinite only.

关键词： coal experimental deformation brittle to ductile transition.

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Micro-and submicrostructural evidence for high-temperature brittle-ductile transition deformation of hornblende: Case study of high-grade mylonites from Diancangshan, western Yunnan

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Science china Earth sciences 2007年第10期50卷 1459-1470页

作者： CAO ShuYun, LIU JunLai? & HU Ling State key laboratory of {2.logical Processes and Mineral Resources (GPMR), china university of {2.sciences, beijing 100083. china key laboratory of lithosphere tectonics and {12. technology of ministry of education, china university of {2.- sciences, beijing 100083. china 1. State key laboratory of {2.logical Processes and Mineral Resources (GPMR) China University of Geosciences Beijing 100083 China 2. key laboratory of lithosphere tectonics and lithoprobing technology of ministry of education China University of Geosciences Beijing 100083 China

OM (optical microscope)/TEM (transmission electron microscope) micro- and submicrostructural analysis of hornblende rocks sheared at high temperatures from the Diancangshan area, western Yunnan reveals evidence for deformation in the brittle-ductile transition of hornblende at middle crustal level (about 637℃ and 0.653 GPa) and mechanisms of deformation in the transitional regime are further discussed. Sheared hornblende rocks at middle crustal level have typical mylonitic microstructures, shown by coarse porphyroclasts and fine matrix grains. Different mineral phases in the rocks show distinct deformation characteristics. Hornblende and feldspar grains are intensely deformed with ob- vious grainsize reduction, but quartz grains are recrystallized dominantly by grain growth. Hornblende grains show typical brittle-ductile transition nature. Initial crystallographic orientations of porphyro- clasts have strong effects on the behavior of grains during deformation. There are mainly two types of porphyroclasts, type I "hard" porphyroclasts and type II "soft" porphyroclasts, with [001] perpendicular and parallel to external shear stresses respectively. "Hard" porphyroclasts generally occur as compe- tent grains that are rarely deformed or sometimes deformed by fracturing and dislocation tangling. "Soft" porphyroclasts are highly deformed primarily by dislocation tangling (as shown in the cores of the porphyroclasts), but twinning, dislocation glide and climb probably due to hydrolytic weakening also contribute to dynamic recrystallization of the porphyroclasts into fine grains in the matrix. The micro- and submicrostructures of the two types of porphyroclasts and fine-grained matrix provide powerful evidence for the behavior of brittle-ductile transition of hornblende grains. It is concluded that twinning nucleation is one of the most important processes that operate during dynamic recrystalliza- tion of hornblende crystals at the brittle-ductile transition. (100) [001] t

关键词： hornblende, brittle-ductile transition, micro-and submicrostructures, twinning nucleation recrystallization, Diancangshan

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The Sequence of Magmatic-Tectonic Events and Orogenic Processes of the Yanshan Belt, North china

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Acta geologica Sinica(English Edition) 2004年第1期78卷 260-266页

作者： DENG Jinfu, SU Shangguo, MO Xuanxue, ZHAO Guochun, XIAO Qinghiu, JI Guangyi,QIU Ruizhao, ZHAO Hailing, LUO Zhaohua, WANG Yang and LIU Cui china university of {2.sciences, beijing 100083.and key laboratory of Lithospheric tectonics and Lithoprobe Techniques, ministry of education of china china university of {2.sciences Beijing 100083 key laboratory of Lithospheric {2. and Lithoprobe Techniques Ministry of Education of China *Correspondence: DENG Jinfu *Correspondence: E-mail: dengjinfu@***

This paper emphasizes that the interactive constraints of geology and isotopic dating is the best approach to construct the geological event sequence, and has compiled 106 data of reasonable isotopic ages for the igneous rocks of the Yanshan belt. We propose a sequence of mgmatic-tectonic events in the Jurassic-Cretaceous Yanshan orogen of North {2.. Five orogenic episodes are divided, (1) pre-and initial orogenic episode (Early Jurassic); (2. early orogenic episode (Middle Jurassic); (3) peak orogenic episode (Late Jurassic); (4) late orogenic episode (early Early Cretaceous), and (5) post-orogenic episode. Each episode is a short cycle, all of the orogenic processes construct a longer cycle, and they, in general, followed a counter-clockwise (ccw) PTt path. Finally, it is suggested that the Yanshanian movement was so intensive that the magmatism and tectonic deformation had involved all the lithosphere thickness and the late-Achaean-formed cratonic lithosphere had been significantly reworked.

关键词： magmatic-tectomc event sequence Yanshan belt orogenic episodes and processes

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New paleomagnetic results from the Yangzhuang Formation of the Jixian System, North china, and tectonic implications

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Science Bulletin 2005年第14期 77-83页

作者： WU Huaichun1, ZHANG Shihong1, LI Zheng-Xiang2. LI Haiyan1 & DONG Jin1 1. State key laboratory of {2.logical Processes and Mineral Resources & key laboratory of lithosphere tectonics and lithoprobing technology of ministry of education, china {12. of {2.sci- ences, beijing 100083. china 2. tectonics Special Research Centre, School of Earth and {2.graphical sciences, The {12. of Western Australia, Crawley, WA 6009, Australia

A paleomagnetic study was carried out on the Yangzhuang Formation （1350 Ma） of the Jixian System in the North china Block （NCB）. Detailed stepwise thermal demagnetization isolated two components. The soft compo- nent （component A） was interpreted as a remagnetization in the recent geomagnetic field. The hard component （compo- nent B） with higher unblocking-temperatures was carried by hematite. Its site-mean direction is D/I = 77.6°/-2..3° （κ = 5.4, α95 = 18.3°, N = 15 sites） before, and D/I = 72.2./11.5° （κ = 2..6, α95 = 7.9°） after tilt correction. It passes a fold test （Mesozoic folding） at 99% confidence level and reversal test at 95% confidence level. The corresponding pole locates at 17.3°N, 2.4.5°E （dp = 4.1°, dm = 8.0°）. A best fit of paleo- magnetic poles from the NCB, Baltica, Siberia and the ap- parent polar wander path for Laurentia suggests a long-lived connection between these paleo-continents between1800 and 1350 Ma.

关键词： North china Block Yangzhuang Formation paleomag- netism Mesoproterozoic Rodinia Columbia.

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Crustal P-wave velocity structure of the Longmenshan region and its tectonic implications for the 2.08 Wenchuan earthquake

Crustal P-wave velocity structure of the Longmenshan region ...

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： LI ZhiWei~(1*),Xu Yi~1,Huang RunQiu~2.Hao TianYao~1,Xu Ya~1,Liu JingSong~1 & Liu JianHua~1 key laboratory of Petroleum Resources Research,Institute of {2.logy and {2.physics,Chinese Academy of sciences, beijing 10002.,china State key laboratory of {2.hazard Prevention and {2.environment Protection,Chengdu university of {12.,Chengdu 610059,china

The P-wave velocity structure of the crust in the Longmenshan region has been imaged by seismic travel time tomography using local and regional first P-wave arrivals recorded from 2.00 to *** tomographic model provides a way to analyze the deep tectonics of the Longmenshan fault belt and the tectonic implications for the 2.08 M8.0 Wenchuan *** P-wave velocity images indicate that the initial rupture site and focal depth of the Wenchuan earthquake,together with the direction of rupture propagation,closely relate to the crustal structure of the Longmenshan *** Pengguan massif to the west of the Longmenshan fault belt is characterized by high velocity anomalies,suggesting that the crust has a strong strain strength that can accumulate large stresses over a long *** M8.0 Wenchuan earthquake is located at the southwestern end of the Pengguan massif and the western edge of the Sichuan *** collision between the Pengguan massif and the Sichuan Basin becomes the primary reason for the occurrence of the M8.0 Wenchuan *** the north of Wenchuan, the occurrence and propagation of rupture benefit from low velocity anomalies along the Longmenshan fault belt;whereas to the south of Wenchuan,the brittle rupture can occur with more difficulty in relatively weak crust with low *** may be one of the reasons for the absence of aftershocks to the south of Wenchuan,and the rupture induced by the M8.0 Wenchuan earthquake propagating from the north to the south along the Longmenshan fault *** deep geodynamics of the M8.0 Wenchuan earthquake may occur due to the discrepancy of crustal structures on the two sides of the Longmenshan fault belt. Ductile deformation and crustal flow can easily occur in the weak middle-lower crust beneath the Songpan-Garze orogenic belt. The eastward movement of the Tibetan Plateau is obstructed by the rigid {2. of the Sichuan Basin,and then the thickening of the middle-lower crust and vertica

关键词： Longmenshan orogenic belt Wenchuan earthquake P-wave velocity Crustal structure travel time tomography

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