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Environmental characteristics of Mid-Holocene recorded by lacustrine sediments from Lake Daihai, north environment sensitive zone, china

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Science china Earth sciences 2006年第9期49卷 968-981页

作者： SUN Qianli1,2, ZHOU Jie1, SHEN Ji3, CHEN Peng1,2, wu Feng1,2 & XIE Xiuping1,2 1. State Key Lab of Loess and Quaternary geology, Institute of Earth Environment, chinese academy of sciences, Xi’an 710075, china 2. Graduate University of chinese academy of sciences, beijing 100039, china 3. Nanjing Institute of Geography and Limnology, chinese academy of sciences, Nanjing 210008, china 1. State Key Lab of Loess and Quaternary geology Institute of Earth Environment Chinese Academy of Sciences Xi’an 710075 China 2. Graduate University of chinese academy of sciences Beijing 100039 China 3. Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China

Climate proxies, such as total organic carbon and nitrogen (TOC, TN), carbonate content (CaCO3), grain-size and pollen of the sediment core retrieved from enclosed Lake Daihai which lies in the north china environment sensitive zone are analyzed to reconstruct the environment evolution of the area based on high-resolution radiocarbon chronology. The results reveal that the TOC and TN contents of the sediments correlate well with pollen percentage and pollen flux variations during the Holocene, and both reach their peak values simultaneously at 6.7―3.5 ka BP (calendar age, 7.6―3.6 ka BP). Since 6.7 ka BP, both the CaCO3 and organic matter contents of the core have simultaneous variations, and their high values also occur during 6.7―3.5 ka BP. While during 9.0―6.7 ka BP (calendar age, 10―7.6 ka BP) relatively lower level of organic matter content and pollen flux corre- spond to the higher level of carbonate content. The above relations suggest that during 6.7―3.5 ka BP, the productivity and effective precipitation were greatly improved in the lake drainage area, and this would probably strengthen the hydrodynamic conditions, enhancing organic matter, pollen and carbonate inputs from terrestrial sources. Such processes would account for the enrichment of both organic matter and carbonate in the sediments. While during 9.0―6.7 ka BP, the lower level of or- ganic matter, pollen flux but high carbonate content show depressed productivity and declined vege- tation coverage. The higher carbonate content at this stage would have probably resulted from the higher evaporation ratio of the lake water under relatively drier climate conditions. Therefore, it is in- ferred that during 6.7―3.5 ka BP, the climate was more humid with abundant rainfalls and vegetation was more flourishing in the Lake Daihai area. This can be seen as Holocene Climate Optimum (HCO). As a result, this has evident discrepancies with the traditional notion that the HCO occurs at Early Holocene or early Mid

关键词： Lake Daihai, Mid-Holocene, lacustrine sediments, environmental characteristics.

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Carbon isotope ratios of C_(4) plants in loess areas of North china

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Science china Earth sciences 2006年第1期49卷 97-102页

作者： WANG Guoan1,2,3, HAN Jiamao 2, ZHOU Liping3, XIONG Xiaogang4, TAN Ming2, wu Zhenhai5 & PENG Jun6 1. Department of Plant Nutrition, china Agricultural University, beijing 100094, china 2. Institute of geology and geophysics, chinese academy of sciences, beijing 10002., china 3. College of Environmental sciences, MOE Laboratory for Earth Surface Processes, Peking University, beijing 100871, china 4. Institute of Botany, chinese academy of sciences, beijing 100093, china 5. Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, china 6. Network Center, china Agricultural University, beijing 100094, china 1. Department of Plant Nutrition China Agricultural University Beijing 100094 China 2. Institute of geology and geophysics Chinese Academy of Sciences Beijing 100029 China 3. College of Environmental sciences MOE Laboratory for Earth Surface Processes Peking University Beijing 100871 China 4. Institute of Botany Chinese Academy of Sciences Beijing 100093 China 5. Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100 China 6. Network Center China Agricultural University Beijing 100094 China

Carbon isotope ratios (δ^(13)C) of 89 C_4 plant samples were determined fromthe loess area in North china. δ^(13)C values vary between -10.5per thousand and -14.6per thousandwith a mean of -12.6per thousand. Along a precipitation gradient from the semi-moist area to thesemiarid area, then to the arid area, the δ^(13)C values of C_4 plants show a slight decreasingtrend. The δ^(13)C values of C_4 plants in the dry season are found lower than those in the wetseason. These trends are opposite to those observed for C_3 species.

关键词： C4 plants, carbon isotope ratios, loess area.

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Tectonic setting of the Helong Block:Implications for the northern boundary of the eastern North china Craton

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Science china Earth sciences 2005年第10期48卷 1599-1612页

作者： ZHANG Yanbin1, wu Fuyuan1, ZHAI Mingguo1 & LU Xiaoping1,2 1. Institute of geology and geophysics, chinese academy of sciences, P.O. Box 9825, beijing 10002., china 2. Regional Geological and Mineral Resources Survey of Jilin Province, Changchun 130062, china Institute of geology and geophysics chinese academy of sciences beijing china Regional Geological and Mineral Resources Survey of Jilin Province Changchun china

LA-ICP-MS zircon U-Pb dating indicates that the Bailiping granitic pluton was em-placed during Late Paleozoic to Early Cretaceous (285―116 Ma) by four distinct magmatic epi-sodes, arguing against the previous thought that the Bailiping granites were emplaced during Archean, Proterozoic or Early Paleozoic. It is suggested that the so-called Archean Jincheng-dong granite-greenstone belt, mainly composed of Bailiping granites, should be broken down. Sr-Nd isotopic compositions of the Bailiping granites are similar to those of the Phanerozoic granites in the Xing’an-Mongolian orogenic belt, suggesting that their parental magmas were mainly derived from a juvenile crust with some contamination of ancient crustal materials during magma rising and/or emplacement. Therefore, the basement of the Helong Block is similar to that in the northern Xing’an-Mongolian Orogenic Belt, but different from that of the North china Craton. It is proposed that the Archean Jinchengdong complex in this area is probably an exotic slice from the North china Craton, which indicates that the Fu’erhe-Gudonghe Fault, located in northern part of the Helong area, is not the boundary between the North china Craton and the Xing’an-Mongolian Orogenic Belt. The possible boundary should be located further southward more than 50 km and near the Baitoushan volcano.

关键词： LA-ICPMS ziron U-Pb dating, Bailiping complex, Helong Block, North china Craton, Sr-Nd isotope.

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Jinning granodiorite and diorite deeply concealed in the central Tarim Basin

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Science china Earth sciences 2005年第12期48卷 2061-2068页

作者： LI Yuejun1, 2, SONG Wenjie2, wu Genyao1, WANG Yifen1, LI Yuping2 & ZHENG Duoming2 1. Institute of geology & geophysics, chinese academy of sciences, beijing 10002., china 2. Tarim Oil-field Company, Petrochina, Korla 841000, china 1. Institute of geology & geophysics Chinese Academy of Sciences 100029 Beijing China 2. Tarim Oil-field Company 841000 Korla PetroChina China

The 7200-m-deep Well Tacan 1 in the central Tarim Basin is the deepest in china. Purplish gray medium-grained granodiorite containing dark gray fine-grained diorite xenolith is revealed at the base of the well (7169―7200 m), and they are results of the Jinning magmatic activities. Trace-element geochemistry and REE profiles of both rock types are similar, indicating that they are calc-alkaline series I-type granitoid. Proxies of diorite signify the development of a magmatic arc due to subduction at ca. 1200 Ma. The granodiorite was formed before 890―932 Ma. However, more study is needed to clarify if the arc diorite represents a ca. 300 Ma extension of the subduction or a reactivation during the orogenic collision event at ca. 900 Ma.

关键词： diorite, granodiorite, magmatic arc, Jinning orogeny, Tarim Basin.

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REE Geochemistry in the Weathered Crust of Granites, Longnan Area,Jiangxi Province

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Acta Geologica Sinica(English Edition) 1990年第2期64卷 193-209,237页

作者： wu Chengyu Huang Dianhao Guo Zhongxun Institute of Mineral Deposits, chinese academy of Geological sciences, beijing Geological Survey Party of South Jiangxi, Jiangxi Bureau of geology and Mineral Resources, Ganzhou, Jiangxi JIANGXI BUR GEOL & MINERAL RESOURCES GEOL SURVEY PARTY S JIANGXIGANZHOUPEOPLES R CHINA

Warm and humid climate and gentle hilly topography have provided favourable conditions for the devel-opment of the weathering crust of the granite intrusions in the Longnan area, Jiangxi Province. REE is mostlyconcentrated in an adsorption state in clay in the wholly weathered zone. The rare-earth minerals enriched inthe parent rocks provided the source material for the REE enrichment. Exchangeable REE accounts for48-86%. Extraction experiments and stable isotopic study of clay minerals suggest that the downward infiltra-tion of meteoric water and increasing gradient of pH values have played an important role in the enrichment ofREE during the progressive weathering. Slight fractionation of individual REE can not change their distribu-tion patterns in the profiles. which are inherited from the parent rocks.

关键词： REE Geochemistry in the Weathered Crust of Granites Longnan Area,Jiangxi Province

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Orogenic and Anorogenic Granitoids in the Altay Mountains of Xinjiang and Their Discrimination Criteria

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Acta Geologica Sinica(English Edition) 1989年第1期63卷 45-64页

作者： Zou Tianren Institute of Mineral Deposits, chinese academy of Geological sciences, beijing Chao Huizhi and wu Baiqing Xinjiang Institute of geology, Ministry of Metallurgical Industry Urumqi, Xinjiang Jiang Minxi 1Teliti and Yang Yueqing also participated in the field work. Those who participated in the laboratory study also include Yang Bingbin Duan Shangzhi Lü Qiaoling Li Longqi and Yu Shimei.

On the basis of field geological studies of the granotoids in the region, mineralogical, petrological, geochemical(including stable isotope geochemical) and isotopic geochronological investigations were carried out on selected representative granitic bodies of various types. The authors have concluded that, apart from the bodies of the orogenic granitoid series, there also exist intrusions of the anorogenic granitoid series in the region. The intrusives of the two series were formed not only in different ages and tectonic environments, but also were derived from different sources of materials. Moreover, they are associated with different mineralizations, belonging to different minerologenetic series(Cheng et al., 1983). They show distinctly a series of discriminative criteria. The problems under discussion in the present paper are of important theoretical and practical significance in the studies of granites of the orogenic belt, particularly the studies of the genesis and related metallogeny of the granites of the region.

关键词： Orogenic and Anorogenic Granitoids in the Altay Mountains of Xinjiang and Their Discrimination Criteria

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PRIMARY PROBLEMS ON THE RELATIONSHIP BETWEEN TECTONICS AND GLOBAL CLIMATE CHANGE

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Scientia Geologica Sinica 2000年第4期 367-374页

作者： Li Jiliang, wu Jun and Wang Yitian (Institute of geology and geophysics, chinese academy of sciences, beijing, 10002.)

On the one hand, the global climate change occurred in Cenozoic, and its tendency was getting colder. During this period there were several abrupt changes. On the other hand, tectonic uplift existed in mountain and plateau areas in Cenozoic, and the total effect remain up to the present. A lot of evidence, macroscopic and microscopic, on climate, uplift and denudation over the world is commented to discuss the relationship between tectonics and global climate change. Geologists, geographers, geophysicists, geochemists and meteorologists should cooperate and work hard to solve this problem.

关键词： rock PRIMARY PROBLEMS ON THE RELATIONSHIP BETWEEN TECTONICS AND GLOBAL CLIMATE CHANGE rate

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CALCISPONGES AND HYDROZOANS FROM PERMIAN REEFS IN WESTERN GUANGXI

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古生物学报 2002年第3期 343-348页

作者： FAN Jia Song 1) , WANG Yu Mao 2) , and wu Ya Sheng 1) 1) Institute of geology and geophysics, the chinese academy of sciences, beijing 10002. 2) The second geological team, Guangxi Bureau of geology and Mineral Resources, Nanning 53000

ＳｕｍｍａｒｙＴｈｅｐｒｅｓｅｎｔｐａｐｅｒｄｅｓｃｒｉｂｅｓｂｒｉｅｆｌｙｓｏｍｅｇｅｎｅｒａｌｆｅａｔｕｒｅｓｏｆｔｈｅＰｅｒｍｉａｎｒｅｅｆｓｅｘｐｏｓｅｄｉｎＴｉａｎｌｉｎ ,ＬｉｎｇｙｕｎａｎｄＦｅｎｇｓｈａ... 详细信息

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关键词： Sphinctozoan Inozoan Hydrozoan reefs Permian Guangxi chinaSummary The present paper describes briefly some general features of the Permian reefs exposed in Tianlin Lingyun and Fengshan counties where abundant framebuilding org

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Indosinian Foreland Fold-and-Thrust Belt Bordering Yunnan and Guangxi,china

Indosinian Foreland Fold-and-Thrust Belt Bordering Yunnan an...

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中国科学院地质与地球物理研究所2001学术年会

作者： wu Genyao Institute of geology and geophysics,chinese academy of sciences,beijing 10002.

Recent discoveries of ophiolites indicate that there must be a Palaeotethyan geosuture zone bordering china and Vietnam,which separates the Vietbac block from the South china *** Indosinian foreland fold-and-thrust belt bordering Yunnan and Guangxi provided further evidence for the *** oceanic crust was subducted southwestwards while the magmatic arc migrated northeastwards,and the continent-arc collision occurred in the Late Triassic with the thrusting being extended towards the north or *** features of thrust-nappe structure are discussed,which proved the continental margin of the Palaeotethyan ocean there to be a complicated one.A face-to-face collision occurred first along the NW-striking segment and then along the ENE-striking segment accompanied by transpression or oblique thrusting occurring along the NW-striking one.

关键词： thrust-nappe structure foreland fold-and-thrust belt palaeotethysides border between Yunnan and Guangxi

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TWO TYPES OF XENOLITH—MANTLE XENOLITH AND CRUSTAL XENOLITH FOUND IN THE CENOZOIC VOLCANIC ROCKS FROM HOH XIL, NORTHERN TIBET PLATEAU

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地学前缘 2000年第S1期7卷 197-198页

作者： wu Cailai,Yang Jingsui,Li Haibing,Shi Rendeng[WT5,5”BX](Institute of geology,chinese academy of Geological sciences,beijing 100037,china)

It is known that large amounts of Cenozoic high potassium volcanic rocks occur on the Tibetan plateau. The question is where do those high potassium magmas come from? Since the plateau is being compressed by subduction and collision from the surrounding continents,it is a puzzle for us what is the formational environment and tectonic setting of these volcanic rocks? In particular,what is the relationship between these special rocks and formation and uplift of the plateau? We recently carried out an investigation on these Cenozoic volcanic rocks in Hoh Xil,northern Tibetan plateau,including volcanic rocks in the Jingyuhu,Xiongyingtai and Shuangquanzi areas. In the region,some older lava flows occur as thick sheets with a flat surface and weathering crust; while some relatively younger lavas remain a relict volcanic cone or vent. Most of the relict cones are small (1 or close to 1,and mostly belonged to shoshonite\|trachyte association and some to ultra\|potassic rocks. The K\|Ar dating of whole rock and mica shows that the volcanism lasts from middle Miocene (15 47Ma) to Pleistocene (0 69Ma); they are 0 69Ma,13 77Ma and 15 47Ma in Jingyuhu; 11 05Ma,12 22Ma and 12 83Ma in Xiongyingai,; 1 58Ma,2 24Ma,5 23Ma,5 85Ma,8 20Ma,8 41Ma and 10 67Ma in *** types of xenolith and xenocryst were found in Jingyuhu and Xiongyingtai,i.e..,crustal xenolith and mantle xenocryst.

关键词： xenolith xenocryst shoshonite trachyte Cenozoic volcanic r ock Tibet Hoh Xil

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