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Discovery and analysis of ultra-micro grinding grain texture in slipping lamellae of ductile-brittle zone

Science China earth sciences 2004年第3期47卷 265-271页

作者： GE Heping1, SUN Yan1, LU Xiancai1, ZHU Wenbin1, GUO Jichun1, LIU Deliang2.& Chi-yuen Wang3 1. department of earth sciences, nanjing university, {2. key laboratory of mineral Deposit, nanjing 2.0093, China 2. department of earth and Space sciences, university of Science and Technology of China, Hefei 2.002., China 3. department of Geology and Geophysics, university of California, Berkeley, CA 9472., USA nanjing Univ Dept Earth Sci State Key Lab Mineral Deposit Nanjing 210093 Peoples R China Univ Sci & Technol China Dept Earth & Space Sci Hefei 230026 Peoples R China Univ Calif Berkeley Dept Geol & Geophys Berkeley CA 94720 USA

Based on the observation of the deep bore cores sampled from the state of Cali-fornia, USA, preferred arranged particulate concentration belts were found in the ultra-slipping lamellae. And the same phenomenon was found again later in the bore cores from the petroleum basin in the Northern Shaanxi Province. It may be the product of the dynamic processes involv-ing tumbling, grinding and compresso-shearing functions, so the spherical particulates with ul-tra-size of nm and mm are called grinding grain. The formation of the grinding grains is related with the ductile-brittle deformation, the lateral pressure of the slipping, and the very low grade of dynamic metamorphism of the rocks. Based on the systematic analysis, it is indicated that some elements like Nb and Ta are enriched in the grinding grains in the granitic rocks because of the chemical differentiation, and that the slipping lamellae bearing grinding grains in mudstone with smear efficiency prove a perfect seal for oil and gas reservoirs. Meanwhile, the paper provides bases for the studies on the fast stick-slip movement and shear paradigm.

关键词： slipping lamellae, grinding grain texture, ductile-brittle deformation, smear efficiency.

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Identification of Hercynian shoshonitic intrusive rocks in central Hainan Island and its geotectonic implications

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Science Bulletin 2006年第20期51卷 2507-2519页

作者： XIE Caifu1, 2. ZHU Jinchu1, DING Shijiang3, ZHANG Yeming2. FU Tai’an2.& LI Zhihong2.1. state key {2. for {2. deposits research and department of earth sciences, nanjing university, nanjing 2.0093, China 2. Yichang Institute of Geology and {2. Resources, Yichang 443003, China 3. Hainan Bureau of Geology and {2. Resources, Haikou 5702.6, China department of Otolaryngology University Hospital VU P.O. Box 7057 1007 MB Amsterdam The Netherlands state key {2. for {2. deposits research and department of earth sciences Nanjing University Nanjing 210093 China

An identification has been made of some shoshonitic intrusive rocks in central Hainan Island recently. These rocks are K-rich (K2.=2.9%―5.1%, K2./Na2.=0.95―2.12., distinctly enriched in LILE and LREE, strongly depleted in Nb, Ta, and moder- ately depleted in Sr and Ti, with (87Sr/86Sr)i = 0.70859―0.7142. and ε Nd(t) = (?2.77―?7.49). They were derived from an EMⅡ-type mantle source. The enrichment process is related to metasomatism of depleted mantle caused by a great amount of fluid-melt released from oceanic crust and terri- genous sediments at great depth (eclogite facies) during the subduction of the South China plate under the Indochina-South China Sea plate in the Carbon- iferous–Early Permian. A SHRIMP U-Pb zircon dating yields a crystallization age of 2.2.7 Ma for the sho- shonitic intrusions, which is coeval with the strongly peraluminous granites found in central Hainan Island. These two kinds of rocks generally possess syn-intrusion ductile deformation structures. Thus they are considered to have been generated during the early stage (syn-thrust phase) of a post-collisional event. The primary magma of shoshonitic rocks was produced at a depth > 80 km by decompression- dehydration melting of previously enriched litho- spheric mantle wedge, phlogopite-bearing garnet peridotite, which was in turn caused by the break-off of a descendent slab and upwelling of a hot as- thenosphere. The rising of melts was accompaniedby crustal contamination and crystallization fractiona- tion (AFC). Combining with other related data, it is proposed that the southwards subduction and amal- gamation of the South China plate with the Indo- China-South China Sea plate took place at ca. 2.7- 2.8 Ma, which was a part of the convergence proc- ess of the Pangea supercontinent. The suture zone was probably located along the line of Song Ma-Beibu Gulf-north margin of the Yunkai Moun- tains-Wuyi Mountains.

关键词： SHRIMP U-Pb dating Hercynian shoshonitic intrusive rocks post-collisional event enriched mantle Hainan Island.

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Isotopic compositions of small shelly fossil Anabarites from Lower Cambrian in Yangtze Platform of South China: Implications for palaeocean temperature

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Progress in Natural Science:Materials International 2007年第10期17卷 1185-1191页

作者： Chen Yongquan1,2. Jiang Shaoyong1, Ling Hongfei1, Yang Jinghong1 and Wan Defan3(1. state key Laboatory for {2. {2. research and Center for Marine Geochemistry research, department of earth sciences, nanjing university, nanjing 2.0093, China 2. Tarim Oilfield Company Exploration & Development research Institute, Ku’erle 841000, China 3. Institute of {2. Resources, Chinese Academy of Geological sciences, Beijing 100037, China) state key Laboatory for {2. {2. research and Center for Marine Geochemistry research Department of Earth Sciences Nanjing University Nanjing 210093 China arim Oilfield Company Exploration & Development research Institute Ku’erle 841000 China Institute of mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China

Anabarites belong to small shelly fossils (SSF), which occur widely in the Lower Cambrian strata of Yangtze Platform in South China. They are phosphate shell in composition and represent the earliest stage of the Cambrian bioradiation of Bilateria, the so-called "Cambrian Explosion". In this study, we attempted to separate Anabarites fossils from Lower Cambrian dolostones, and we obtained samples of both the fossils (SSF) and the granular phosphates (GP). Isotopic analyses were performed on samples of SSF, GP, and matrix dolostone (DH-2.). The results showed that the δ30Si values of the quartz filling in fossils celoms, and the siliceous materials in granular phosphates are -0.6‰ and -0.7‰, which is different from normal sedimentary siliceous rocks from the Lower Cambrian strata (0—0.7‰) as reported by Li et al., but is consistent with the data for siliceous rocks and cherts of submarine hydrothermal origin. It is likely that a later hydrothermal replacement could have taken place in the SSF-bearing sedimentary rocks. The oxygen isotope values of the phosphate of SSF and GP are 16.8‰ and 17.0‰, respectively. These are significantly higher than the Neoproterozoic phosphate ores (10.9‰—13.9‰) as reported by Ling et al., hence, late diagenesis and hydrothermal replacement may not have caused a significant change in the oxygen isotope compositions of the small shelly fossils, and the calculated temperatures (2..4—2..3℃) for palaeo-seawater using a SSF phosphate oxygen isotope thermometer are therefore considered here as the upper limit of seawater temperature in the Early Cambrian ocean of the Yangtze Platform.

关键词： Anabarites oxygen isotope silicon isotope paleo-temperature.

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Investigation of the Buffering Function of Aluminum being in Equilibrium with the mineral Kaolinite in Acidic Natural Water

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Chinese Chemical Letters 2000年第7期11卷 655-658页

作者： Feng LIU Shu Ping BI Ning GAN(department of Chemistry, state {2. {2. of Pollution Control & Resource Reuse,nanjing university, nanjing 2.0093) nanjing Univ Dept Chem State Key Lab Pollut Control & Resource Reuse Nanjing 210093 Peoples R China

This paper presents a computer model to investigate the buffering function of aluminum being in equilibrium with mineral kaolinite in acidic natural water. Factors affecting the theoretical pH values are discussed. Th... 详细信息

关键词： kaolinite aluminum buffering function

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A Study of Sr, Nd and O Isotopes of the K-rich Melanocratic Dykes in the Late Mesozoic Gold Field in the Jiaodong Peninsula

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Acta Geologica Sinica(English Edition) 2001年第4期75卷 432-444页

作者： SUN Jinggui, HU Shouxi, LIU Jianmin, SHEN Kun and LING Hongfei earth Science Institute, Jilin university, Changchun 130062.{2. key laboratory of research on Metallogenesis of Endogenic Ore deposits,nanjing university, nanjing 2.0093 Institute of Geology and Geophysics, Chinese Academy of sciences, Beijing 100101 Shandong Institute and laboratory of Geological sciences, Jinan 2.0013 earth Science Institute Jilin University Changchun 130062 state key {2. of {2. on Metallogenesis of Endogenic Ore deposits Nanjing University Nanjing 210093 Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100101 Shandong Institute and laboratory of Geological sciences Jinan 250013 [?]5Sun Jinggui Born in 1961 graduated from the former Changchun university of Science and Technology in 1984. He got his Master's and Doctoral degrees at the same university in 1991 and 1998 respectively. He is now an associate professor at the university and has long been engaged in teaching and research work in petrography and mineral deposits.

Geologic, petrographic and petrochemical studies of the late Mesozoic K-rich melanocratic dykes, including lamprophyres, andesite porphyrites and dacite-porphyry in the gold field system in the Jiaodong Peninsula, China, have shown that these dykes are characterized by rich potassium and alkali but poor titanium. They belong to an ultra-high potassic, shoshonitic and high potassic calc-alkaline rock series. The parental magma has relatively high initial strontium ratios ((87Sr/86Sr),=0.70895-0.71140) and low (143Nd/144Nd)1 ratios (varying from 0.51135 to 0.512.1); and its δ18Osmow, whole rock values vary from +5.8%c to +10.6%c with a mean of +7.1%c. These features suggest that the source region of the magma is an enriched mantle wedge transformed from a continental lithosphere mantle which has experienced metasomatism by mantle-derived fluids with H2.-dominated fluids that were provided during the underthrusting of an ocean crust. The initial magma was generated by low-degree partial melting of the enriched mantle in its mature stage in the back-arc spreading environment. The evolution of magmas is associated with two trends, i.e., fractional crystallization and mixing with or intensive contamination by palaeo-crust materials or metamorphic rocks. The former process is evident in the gold field system of quartz-vein type, whereas the latter is dominated in the gold field system of the altered-rock type. This conclusion is very important for more detailed study of petrogenesis and mineralization through the crust-mantle interaction (exchange) in the Mesozoic in this region.

关键词： late Mesozoic K-rich melanocratic dykes Sr Nd and O isotope geochemistry gold field system in the Jiaodong Peninsula

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Multistage evolution of continental collision orogen:A case study for western Dabie orogen

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Chinese Science Bulletin 2009年第15期54卷 2568-2579页

作者： WU YuanBao state key {2. of Geological Processes and {2. Resources, Faculty of earth sciences, China university of Geosciences, Wuhan 430074, China state key {2. of Continental Dynamics, department of Geology, Northwest university, Xi’an 710069, China state key {2. of Geological Processes and {2. Resources Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China state key {2. of Continental Dynamics Department of Geology Northwest University Xi’an 710069 China

The foramtion and evolution of collisional orogen is a prominent feature along convergent plate margins, and is generally a complex process. This article presents an integrated study of zircon genesis, U-Pb age and Lu-Hf isotope composition as well as geological characteristics for the western Dabie orogen to constrain its multi-stage evolution history. The results suggest that the formation of oceanic crust in the Huwan area was constrained at ca. 400―430 Ma, which was slightly later than the collision of the northern Qinling with the North China Block. It formed in a marginal basin in the northern margin of the Yangtze Block. The peak metamorphism of eclogite in the Huwan area occurred at ca. 310 Ma, and the timing of the initial exhumation of oceanic eclogite was about 2.0 Ma. The high to ultrahigh pressure (HP-UHP) metamorphic rocks in the Xinxian and the Hong'an metamorphic zones have the same ages and natures as those of the HP-UHP metamorphic rocks in the other Dabie-Sulu terrains, and also have experienced multi-stage exhumation, and thus can be taken as a coherent part of the Dabie-Sulu orogen. Therefore, the Qinling-Dabie-Sulu orogen is a typical multi-stage continental collision orogen, with an amalgamation process extending more than 2.0 Ma.

关键词：大别造山带大陆碰撞西部演变超高压变质岩碰撞造山带苏鲁造山带变质岩区

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Recent progress in studies on the nano-sized particle layer in rock shear planes

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Progress in Natural Science:Materials International 2008年第4期18卷 367-373页

作者： Yan Suna, Liangshu Shua, Xiancai Lu a, Hao Liua, Xihui Zhang b, Aiming Linc, Kazuo Kosaka d a department of earth sciences, state {2. {2. of mineral Deposites research, nanjing university, nanjing 2.0093, China b department of Management Information Systems, university of Memphis, Memphis, Tennessee 38152. USA c department of Geosciences, Shizuoka university, Shizuoka 42.-852., Japan d department of Geosystem sciences, Nihon university, Tokyo 156-8550, Japan department of earth {2. State Key Laboratory of Mineral Deposites Research Nanjing University Nanjing 210093 China department of Management Information Systems University of Memphis Memphis Tennessee 38152 USA department of Geosciences Shizuoka University Shizuoka 422-8529 Japan department of Geosystem sciences Nihon University Tokyo 156-8550 Japan

Since the 1990s, an ultramicro-particle texture in nano- or micron-sized scale has been continually found in shear planes of various rocks, and recently further progress was made in generic physical mechanisms. In this article, the characteristics of the nano-sized particle layer in rock shear planes (including widespread distribution, layering texture, non-linear genetic mechanism, and multiple functions) on an ultra micro-scale were briefly introduced and more information was obtained by analyzing cases from home and abroad. Our findings suggest that (1) there is a paragenetic relationship between the development of shear frictional- viscous and the formation of nano-sized particles, and (2. in the shear movement, partitioning, segregating, and layering in rocks are initiated by the sliding motion of the nano-sized particle layer. Moreover, the plastic rheology of rocks is essentially the move- ment of ultra-micro-sized particles (nano-size and micro-size), and the nano-sized particle layer in rock shear planes is characterized by some particular physical and chemical effects.

关键词： Shear plane Nano-sized particle Frictional-viscous Plastic rheology High field strength elements

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New Advances of Silicon and Boron Isotope Geochemistry in the Study of Precambrian Ore deposits

New Advances of Silicon and Boron Isotope Geochemistry in th...

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International Conference of mineralization in Precambrian Terranes & Unesco/Iugs Igcp 443 Annual Meeting and Field Correlation 2.03

作者： Shao-Yong JIANG state key {2. for {2. deposits research, department of earth sciences, nanjing university, nanjing 2.0093, China

In the field of stable isotope geochemistry,Oxygen, hydrogen, carbon and sulfur isotopes have already been widely used in the study of Precambrian ore *** recent years,it has been increasingly recognized that some new isotope systems,such as Si and B, are very useful geochemical tracers in the study of hydrothermal ore-forming *** this paper,I will present and summarize our recent research using these new isotopes to trace the sources and origin of ore deposits in Precarnbrian terranes,including banded iron formation,borate deposits, and massive sulfide deposits.

关键词： origin New Advances of Silicon and Boron Isotope Geochemistry in the Study of Precambrian Ore deposits

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The great Ordovician radiation of marine life: Examples from South China

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Progress in Natural Science:Materials International 2008年第1期18卷 1-12页

作者： Renbin Zhan a,*, Jisuo Jin b, Yuandong Zhang a, Wenwei Yuan a a state key {2. of Palaeobiology and Stratigraphy, {2. Institute of Geology and Palaeontology, Chinese Academy of sciences, {2. 2.0008, China b department of earth sciences, university of Western Ontario, London Ont., Canada N6A 5B7 state key {2. of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China department of earth {2. University of Western Ontario London Ont. Canada N6A 5B7

The Ordovician radiation is the earliest and most important biodiversification event in the evolution of the Paleozoic Evolutionary Fauna (PEF), when the basic framework of PEF was established. The radiation underwent a gradual, protracted process spanning more than 40 million years and was marked by several diversity maxima of the PEF. Case studies conducted on the Upper Yangtze Platform (South China Palaeoplate) showed that the Ordovician radiation was characterized by drastic increases in a- and b-diversity in various groups of organisms. During the radiation, brachiopods, trilobites, and graptolites of the PEF became more diverse to dominate over the Cambrian Evolutionary Fauna (CEF) in all marine environments. At either global or regional scales, however, the Ordovician radiation was highly heterogeneous in time and space, and the rate and pattern of radiation exhibited by difierent major fossil groups were also variable.

关键词： Ordovician radiation Paleozoic Evolutionary Fauna a-diversity b-diversity Upper Yangtze Platform

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Environmental archaeology of the Dachang region in the Daning Valley,the Three Gorges reservoir region of the Yangtze River,China

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Chinese Science Bulletin 2008年第S1期53卷 140-152页

作者： ZHANG Yun 1 &ZHU Cheng 2.1 state key {2. of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of {2.,Beijing 100093, China 2.School of Geographic and Oceanographic {2.,nanjing university,nanjing 2.0093,China 1. state key {2. of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing 100093 China 2. School of Geographic and Oceanographic sciences Nanjing University Nanjing 210093 China

Environmental archaeology of archaeological sites on both sides of the Dachang section in the Daning River,the Three Gorges of the Yangtze River,shows that riverbed evolution has a great influence on the distribution of archaeological sites during the prehistorical and historical period,and it restricts human activity and the development of ancient *** investigation,dating data,paleocurrent analysis of 100 gravels on the riverbed and archaeological excavation reveal that the riverbed of the Dachang section developed in the Shuangyantang region during the early stage,after about 30 kaBP it shifted westward gradually and reached the present *** with the westward shift,the focus of ancient culture changed for several *** the Western Zhou Dynasty's period,the east riverbank of the Daning River was the main residential *** the Han Dynasty,along with the westward shift,the living space of ancient people was no longer confined to the east riverbank and the focus of culture moved *** the Zhangjiawan site became the main dwelling *** the late Han Dynasty, the villages were flooded and the ancients had to immigrate to a high *** of the Han and the Jin Dynasties outcropped on the flood plain of the east bank because their surface sediments were eroded by several flood events and the westward shift of the riverbed.

关键词： the Daning River environmental archaeology the Shuangyantang site the Zhangjiawan site tombs of the Han and the Jin Dynasties

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