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Late Cambrian Magmatic Events in SW Yunnan and Implications for the Tectonic Reconstruction of Northern Gondwana

Journal of Earth Science 2024年第5期35卷 1407-1425页

作者： Guichun Liu Jianwei Zi Xiaomei Nie M.Santosh Cai Zhu Wei Wang Tianyu Zhao Guangyan Chen Qinglai Feng Yunnan Institute of Geological Sciences Kunming 650216China School of Earth Sciences China University of GeosciencesWuhan 430074China State Key Lab of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China John de Laeter Centre State Key Curtin UniversityBentley 6102Australia School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Department of Earth Science University of AdelaideAdelaide SA5005Australia Yunnan Geotechnical Engineering Survey and Design Institute Kunming 650214China Yunnan Exploration Institute of Geology and Mineral Resources Kunming 650051China

In this study,we investigated Early Paleozoic magmatic rocks of the Manlai Formation exposed along the eastern margin of the Lancang terrane to better understand the tectonic history of the *** present petrological,geochemical and whole-rock Sr-Nd and zircon Hf isotopic data for basalts and gabbros sampled from the Qianmai mé*** grains from six basaltic and gabbroic samples yielded U-Pb ages of 495-482 *** rocks are characterized by tholeiitic and Nbenriched compositions,with Nb/La ratios in the range of 0.38-1.38,similar to the typical Nb-enriched *** the mafic rocks show slightly negative to positiveε_(Nd)(t)(-1.67 to+4.32)and zirconε_(Hf)(t)values(-7.3 to+3.8).Elemental and isotopic data suggest that the Qianmai Nb-enriched mafic rocks were mainly derived from the mixing of an OIB-like source with a subduction-modified mantle wedge *** with magmatic and sedimentary records of similar ages in the Lancang terrane and the Baoshan Block,our results reveal Early Paleozoic magmatic and sedimentary sequences along an active margin of the *** into account the recently identified Early Paleozoic ophiolitic mélange in the Yunxian-Menghai belt,we consider the Qianmai magmatic rocks to represent the products of early-stage subduction-related magmatism within a primitive island arc or fore-arc setting associated with the southward subduction of the *** infer that prolonged south-dipping subduction on the northern margin of Gondwana persisted from the Cambrian to the Late Ordovician.

关键词： Qianmai melange Nb-enriched basalts island arc Proto-Tethys northern margin of Gondwana SW Yunnan tectonics geochemistry

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Origin of the Zedang and Luobusa Ophiolites, Tibet

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Acta Geologica Sinica(English Edition) 2014年第2期88卷 669-698页

作者： BAO Peisheng SU Li WANG Jun ZHAI Qingguo Institute of Geology Chinese Academy of Geological Sciences Institute of Earth Sciences China University of Geosciences

The Zedang and Luobusa ophiolites are located in the eastern section of the Yalung Zangbo ophiolite belt,and they share similar geological tectonic setting and ***,an understanding of their origins is very important for discussion of the evolution of the Eastern Tethys *** is no complete ophiolite assemblage in the Zedang *** Zedang ophiolite is mainly composed of mantle peridotite and a suite of volcanic rocks as well as siliceous rocks,with some blocks of *** mantle peridotite mainly consists of Cpx-harzburgite,harzburgite,some lherzolite,and some dunite.A suite of volcanic rocks is mainly composed of caic-aikaline pyroclastic rocks and secondly of tholeiitic pillow lavas,basaltic andesites,and some boninitic rocks with a lower TiO2 content （TiO2 ＜ 0.6％）.The pyroclastic rocks have a LREE-enriched REE pattern and a LILE-enriched （compared to HFSE） spider diagram,demonstrating an island-arc *** tholeiitic volcanic rock has a LREE-depleted REE pattern and a LILE-depleted （compared to HFSE） spider diagram,indicative of an origin from *** boninitic rock was generated from fore-arc *** Luobusa ophiolite consists of mantle peridotite and mafic-ultramaflc cumulate units,without dike swarms and volcanic *** mantle peridotite mainly consists of dunite,harzburgite with low-Opx （Opx ＜ 25％）,and harzburgite （Opx ＞ 25％）,which can be divided into two facies *** upper is a dunite-harzburgite （Opx ＜ 25％） belt,containing many dunite lenses and a large-scale chromite deposit with high Cr203; the lower is a harzburgite （Opx ＞25％） belt with small amounts of dunite and *** Luobusa mantle peridotite exhibits a distinctive vertical zonation of partial melting with high melting in the upper unit and low melting in the *** mantle peridotites are highly depleted,with a characteristic U-shaped REE pattern peculiar to fore-arc *** Luobusa cumulates are composed of wehrlite and olivine-pyroxe

关键词： Zedang ophiolite Luobusa ophiolite MORB island arc fore-arc extension subduction initiation

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Volcanism Pacing Slumping Gravity Flow Deposits during the Late Carboniferous in the Southern Margin of the Junggar Basin,China

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地质学报:英文版 2023年第5期97卷 1422-1450页

作者： LI Shixin ZHANG Tingshan ZHANG Xi LIANG Zeliang JI Dongsheng Mihai Emilian POPA YONG Jinjie LUO Jinyu ZENG Jianli ZHU Haihua School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Natural Gas Geology Key Laboratory of Sichuan Province Southwest Petroleum UniversityChengdu 610500China PetroChina Xinjiang Oilfield Company KaramayXinjiang 834000China Faculty of Geology and Geophysics University of BucharestBucharest 010041Romania

Deep-water gravity depositional processes and evolution in arc systems have become topics of intense research focus in recent *** study discusses the co-evolution of volcanism and deep-water gravity flow deposits at the southern margin of the Junggar Basin,based on petrology,geochronology and geochemical *** results show that a massive collapse of unstable sediments from the slope was triggered by volcanism,resulting in the formation of slumping gravity *** occurrence of volcanic beds in the slump deposits confirm that synchronous volcanism likely affected sediment instability,triggering gravity *** Th/Yb,Ta/Yb and Th/Ta elemental ratios,U-Pb ages of detrital zircons and paleocurrent directions indicate that the North Tianshan(NTS)island arc represents the provenance of the Qianxia ***,statistical data on the pyroclastic components in the gravity flow deposits reveal an intensity index of volcanism,indicating that volcanism is strongly related to gravity flow deposits,especially in terms of the type and distribution of the deposits.A model for volcanically-triggered deep-water gravity flow deposits is established,in order to provide a more in-depth understanding of the co-evolution of volcanism and gravity flow deposits within the depositional setting of the late Paleozoic NTS oceanic subduction margin in the Junggar Basin.

关键词： volcanism trigger gravity flow deposits island arc Qianxia Formation Junggar Basin

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Rock-forming mechanism of Fenghuangshan rockbody in Tongling area

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Journal of Central South University of Technology 2003年第3期10卷 216-221页

作者：邵拥军彭省临吴淦国刘亮明赖健清张达 Geoscience and Resource College China University of Geoscience. Beijing 100083 China School of Geoscience and Environmental Engineering Central South University Changsha 410083 China Geoscience and Resource College China University of Geoscience Beijing 100083 China

Based on the detailed geological investigation and record of galleries and drill holes, a new idea has been advanced that granodiorite is earlier than quartz monzodiorite porphyry. Both of them are products of two different magmatic intrusive activities. The analysis results of trace elements show that the Sr content is beyond any other crustal rock and the Th content is beyond that of Ta. The whole-rock analysis indicates that rockbody is rich in CaO and poor in K2O. In the composition of Pb istope of rockbody, the ratio of 207 Pb to 204Pb is less than 15. 60. All these show that the magma mainly comes from the upper mantle. Ti,Zr,Cr,Nb trace elements and the relation between the Gardini index(τ) and the Rittmann index(σ) indicate that the rockbodies are formed in the orogenic belt and island arc tectonic setting. The summation (2REE) and the characteristic value(m( La)/m( Yb)) of the rare earth elements show that the original rock is alkalic basalt. The analysis of the characteristic values of REE and the quantitative modeling calculation indicate that the rock-forming process is dominated by mixed crystallization. According to the analysis on the rock-forming order, magmatic source, tectonic setting and rock-forming process, combined with the achievements of regional rock-controlling structures and division of sublayer of crust, it is believed that Fenghuangshan rock body derives from the deep-seated alkalic basalt magma. The rock-forming process has undertaken sialic and calcareous assimilation and contamination of two different degrees. The rock-forming model belongs to the typical assimilation and fractional cryatalization mechanism.

关键词： complex rockbody upper mantle erogenic belt island arc alkalic basalt assimilation and fractional crytalization mechanism

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Large scale characteristic distance between strong earthquake

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Acta Seismologica Sinica(English Edition) 1997年第5期10卷 114-124页

作者：杜先富许绍燮 1. Institute of Geophysics State Seismological Bureau Beijing 100081 China

The global seismicity shows a characteristic distance of about 23°. The middle deep and deep earthquakes in the European and Asian blocks concentrate on several zones which separate about 23° away from earch other. The shallow strong earthquakes ( M S≥7) form belts of over 20°, the ends of these belts are near the concentration points of middle deep and deep earthuakes. The Circular Pacific island arcs, volcanoes, shallow earthquakes, middle deep and deep earthquakes also show the characteristic distance of about 23°.

关键词： seismic characteristic distance deep earthquake strong earthquake island arc seismic correlation

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Volcanism in Sanjiang Tethyan Orogenic Belt:New Facts and Concepts

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Journal of Earth Science 1991年第1期10卷 61-77页

作者： Mo Xuanxue Lu Fengxiang Deng JinfuChina University of Geosciences , Wuhan 430074

Sanjiang area in Southwestern China is tectonically situated at the east end of Himalaya-Tethys tectonic domain and at the conjunction of Tethyan Mountain Chain and Circum-Pacific Mountain Chain. It is one of the key areas to understand the global tectonics and also one of gigantic metallogenic provinces in China and even in the world . Volcanism had occurred during the period of time from Proterozoic to Cenozoic . The most important and active periods of volcanism , however , are Carboniferous , Permian and Triassic . The pattern of spatial distribution of Sanjiang volcanic rocks and ophiolites can essentially be described as that several intra - continental micro-massif volcanic districts are respectively sandwiched between each two of four coupling ophioh'te - arc volcanic belts , which are successively from west to east : Dingqing - Nujiang belt , Lancangjiang belt , Jinshajiang belt and Ganzi-Litang belt . Four tectono - magma tic types of volcanic rocks have been rec-ognized in Sanjiang area as follows: mid -ocean- ridge/ para - mid - ocean - ridge type , arc type , collision type and intra - continent type . The petrotectonic assemblages within suture zones , such as oceanic assemblage , subduction - related assemblage , collision - related assemblage etc ., have been paid more attention to because of their significant importance in reconstruction of the history of Sanjiang Tethyan orogenic belt and plate tectonics .Couph'ng ophiolite - arc volcanic belt, para-mid - ocean - ridge volcanism and volcanic rocks, post -collision arc volcanism and volcanic rocks and tensional volcanic arc are newly defined in the present work . These new facts and concepts will be greatly beneficial to understanding the history of Sanjiang Tethyan plate tectonics and the complexity of the volcanism in orogenic belts and of the evolution of the continental lithosphere . A preliminary model of the evolution of Sanjiang Tethys under petrotectonic constraints was presented . It consis

关键词： island arc ophiolite collision Tethys volcanism Sanjiang area .

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An Example for arc-Type Granitoids Along Collisional Zones:The Pertek Granitoid,Taurus Orogenic Belt,Turkey

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International Journal of Geosciences 2011年第3期2卷 214-226页

作者： Sevcan Kürüm Bünyamin Akgül Ayten Oztüfekci Onal Durmus Boztug Yehudit Harlavan Melek Ural University of Firat Engineering FacultyDepartment of GeleogyElazigTurkey University of Tunceli Engineering FacultyDepartment of GeleogyTunceliTurkey Geological Survey of Israel JerusalemIsrael

The Pertek granitoid consisting dominantly of diorite, quartz diorite, quartz monzodiorite, tonalite and lesser granite, adamellite and syenite, is considered to form the easternmost continuation of the Central Anatolian Crystalline Complex. Diorite and monzonites of this granitoid complex are cut by the granitic dykes. The Pertek granitoid, in the study area, is found in the Permo-Triassic Keban metamorphic sequence along intrusive and tectonic contacts. Along the intrusive contacts metasomatic mineralizations are common. Granitoids are, depending on the mineralogical composition, low-, middle- high-K subalkaline features. Major oxide-SiO2 variation diagrams show that fractionation (particularly plagioclase, hornblend, pyroxene and olivine fractionation) played an important role on the granitoid formation during a continuous crystallization process. Distribution of the samples from the Pertek granitoid in the tectonic setting diagrams, and their chondrite- and primordial mantle-normalized trace element patterns resemble to the of arc-type granitoids. Trace element and rare earth element compositions indicate that the magma, from which the Pertek granitoid crystallized, derived from a mantle that was enriched by the fluids derived from the subducted slab, however this magma was contaminated by the crust during its intrusion. These geochemical characteristics are also supported by the field observations. The field and geochemical characteristics of the Pertek Granitiod suggest that they are similar to the other granitoids cropping out in the central and eastern Anatolia and they form the lateral continuation of the same magmatic belt.

关键词： Pertek Tunceli island arc Granitoid Geochemistry

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The zircon SHRIMP chronology and trace elementgeochemistry of the Carboniferous volcanic rocksin western Tianshan Mountains

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Science Bulletin 2005年第19期 83-94页

作者： ZHU Yongfeng, ZHANG Lifei, GU Libing, GUO Xuan & ZHOU Jing The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China

The genesis of the Carboniferous volcanic rocks in the Dahalajunshan group, mainly consisting of trachytes and trachy-andesites and distributing widely in western Tianshan Mountains, remains to be controversial. It has been proposed to be relevant to “rift” or “plume”. Detailed pe-trology and geochemical data presented in this paper show that these volcanic rocks represent typical continental arc magmatism. The volcanic rocks are mainly trachy-andesitic, and the magma source is enriched in LILE, Th and Pb, and depleted in HFSE and Ce. Trace element geochemical study suggests that the basalts could be modeled by 7%-11% partial melt of garnet lherzolite. The volcanic rocks in the Dahala-junshan group are neither the products of “rift” nor so-called “plume” but represent the continental island arc of the Pa-leo-Southern Tianshan Ocean. The mantle wedge had been modified by the melt generating in subduction zone during a long evolution history of this island arc. The continental crust materials (i.e. mainly sediment on ocean floor) had been added into island arc through melt in subduction zone. Volcanic rocks occurring in different regions might represent magma eruption in different time. The zircon SHRIMP dat-ing indicates that the ages of the basalt varies between 334.0 Ma and 394.9 Ma. The 13 analyses give an average age of 353.7 ±4.5 Ma (MSWD = 1.7). The apparent ages of zircons in trachy-andesite vary between 293.0 Ma and 465.4 Ma. All analyses fall on the U-Pb concordant line and are divided into two groups. 8 analyses produce an average age of 312.8±4.2 Ma (MSWD = 1.7), which represents the crystal-lizing age of zircon rims in trachy-andesite. The acquired two ages (i.e. 354 and 313 Ma) belong to the Early Carboniferous and Late Carboniferous epochs, respectively. Thus, the Da-halajunshan group would be separated into several groups with the accumulation of high-quality age dating and data of trace element and isotopic geochemistry, in our opinion.

关键词： zircon SHRIMP island arc Dahalajunshan group Xin-jiang Western Tianshan Mountains

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Late Paleozoic magmatic record of East Junggar,NW China and its significance:Implication from zircon U-Pb dating and Hf isotope

Late Paleozoic magmatic record of East Junggar,NW China and ...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Patrick Asamoah Sakyi Department of Earth Science University of GhanaP.O.Box LG 58Legon-AccraGhana

Late Paleozoic magmatic rocks(including basic dykes,basaltic andesite,rhyolite,keratophyre and syenite-porphyry with minor tuff) are widespread in the western margin of the East Junggar ***-situ zircon U-Pb dating and Hf isotope analyses were carried out for these magmatic rocks from the Baijiangou and Zhangpenggou localities of East Junggar,integrating with geochemical data,to investigate their tectonic evolution as well as crustal accretionary process of this region in the Late *** zircons from basic dykes range in age from 435 Ma to 300 *** Zhangpenggou rhyolite and keratophyre have typical arc-like geochemical signatures and were formed in the Early Carboniferous(332 Ma and 336 Ma, respectively),suggesting they are products of subduction-related *** Baijiangou rhyolites were formed in the Late Carboniferous(315 Ma and 323 Ma) and their formation ages are similar to those of the syenite-porphyries(307 Ma and 312 Ma).The Hf model ages and the formation ages of zircons from these magmatic rocks are alike,with positiveε(t) values vary from +0.7 to +16.6,implying that voluminous growth of juvenile crust happened in the East Junggar terrane during the Late *** absence of Precambrian inherited zircons in basic dykes indicates the lack of Precambrian basement beneath the East Junggar *** geochronological studies on regional ophiolites into account,the East Junggar terrane is considered as a Devonian-Carboniferous oceanic island arc which has been continuously accreted to the southern active margin of the Siberian Craton since the Early Carboniferous.

关键词： Central Asian Orogenic Belt The East Junggar terrane Subduction-related magmatism island arc Juvenile crust

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Remelting of Neoproterozoic relict volcanic arcs in the Middle Jurassic:Implication for the formation of the Dexing porphyry copper deposit,Southeastern China

Remelting of Neoproterozoic relict volcanic arcs in the Midd...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Xuan Liu Hong-Rui Fan M.Santosh Fang-Fang Hu Kui-Feng Yang Qiu-Li Li Yue-Heng Yang Yongsheng Liu Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Division of Interdisciplinary Science Faculty of ScienceKochi University State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

The Dexing copper deposit in southeastern China is a typical non-arc porphyry deposit,the origin of which has been a topic of debate for several *** we present new results from U-Pb geochronology,whole-rock chemistry and Sr-Nd-Hf-O isotopic investigations on the ore-forming granodioritic ***-ICPMS zircon U-Pb data suggest that the granodioritic porphyry was formed in the Middle Jurassic(ca.172.5 Ma) probably associated with lithospheric thinning driven by either sub-continental lithospheric mantle delamination or asthenospheric *** porphyry displays both arc-like and adakitic trace element signatures. The adakitic features suggest that HREE(heavy rare earth elements)-rich minerals such as garnet and hornblende,in the absence of plagioclase resided in the source *** arc-like signatures are broadly comparable with those of the proximal Neoproterozoic island arc rocks including the keratophyre from Shuangxiwu Group and associated granitoids indicating a potential genetic *** porphyry has chondritic cNd(t) of—0.28 to 0.25 and radiogenic cHf(t) of 2 to 7,and correspondingly,uniform two stage depleted mantle Nd model ages of 940-980 Ma and Hf model ages of 800-1100 Ma(mean -920Ma). On Nd and Hf isotopic evolution diagrams,these values are markedly similar to those of the adjacent Neoproterozoic arc rocks when calculated forward to the *** of the porphyry show mantle-like oxygen isotope characters with δO values clustering in the range of 4.7-5.9‰,similar to the values for the Neoproterozoic arc rocks mentioned *** geochemical and isotopic features recorded in our study suggest mantle-derived magmas with no significant supracrustal input for the source of the porphyry. With regard to the source of the Cu ore,we consider a model involving the remelting of sulfide-bearing arc-related lower crustal ***,the occurrence of a Neoproterozoic VMS(volcanic massive sulfide) type copper deposit(the Pi

关键词： island arc Geochronology Geochemistry Zircon Hf-O isotopes Dexing Cu deposit Southeastern China

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