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Nature of the Precambrian metamorphic blocks in the eastern segment of Central Tianshan:Constraint from geochronology and Nd isotopic geochemistry

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Science china earth Sciences 2004年第12期47卷 1085-1094页

作者： LIU Shuwen,GUO Zhaojie,ZHANG Zhicheng,LI Qiugen & zheng haifei The Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,{2. school of earth and space Sciences,peking university,beijing 100871,{2. 1. The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education China 2. school of earth and {2. Sciences Peking University 100871 Beijing China

Granitoid gneisses are widespread in Precambrian metamorphic blocks of eastern segment of the Central Tianshan Tectonic Zone, and they have intrusive contact relationships with their metamorphic sedimentary country rocks of Proterozoic Xingxingxia and Kawabulag groups. Zircon U-Pb ages from a granodioritic gneiss (IW11-1) and a parametamorphic schist (W05-9) are determined at the Weiya area. Euhedral prismatic zircons from the granodioritic gneiss (IW11-1) provide U-Pb isotopic discordia intercept ages of 12.8±17 Ma and 42.±2. Ma, respectively, and euhedral prismatic zircons from the parametamorphic schist (W05-9) display U-Pb isotopic discordia intercept ages of 12.6±74 Ma and 2.0±15 Ma, respectively. A whole-rock Sm-Nd isotopic isochron is determined in augen granitoid gneiss samples at the Gang- gou-Kumishi area and we obtain the isochron age of 1142.12. Ma, and its ε Nd (t) = -4.3. These geochronological data suggest that these Precambrian metamorphic basement blocks within eastern segment of the Central Tianshan Tectonic Zone can be produced during 1140—12.0 Ma, and occur a nearly homochronous metamorphism. Integrated to these geochronological data, Nd depleted mantle model ages (T DM ) and epsilon Nd(t) values of these granitoid gneiss samples indicate that they can derive from mixing in various scales both magmas from mantle and crust sources at a late Mesoproterozoic active continental margin tectonic environment. Similarity in geochronology, Sm-Nd isotopic geochemistry between Weiya-Xingxingxia, Pargangtag and Ganggou-Kumishi areas suggests that they could be a bigger uniform metamorphic basement block, which could be formed by the assembly of the supercontinent Rodinia and be separated by late geological processes.

关键词： Central Tianshan Tectonic Zone, Precambrian metamorphic blocks, granitoid gneisses, isotopic chronolo-gy, active continental margin, supercontinent Rodinia.

Neogene integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science china earth Sciences 2024年第4期67卷 1326-1359页

作者： Tao DENG Xiaomin FANG qiang LI Shiqi WANG Feixiang WU Sukuan HOU Jiao MA Qigao JIANGZUO Danhui sun Yan {2. Qinqin SHI Boyang sun Lu LI Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China CAS Center for Excellence in Life and Paleoenvironment Beijing 100044China university of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Tibetan Plateau earth Sciences and Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing 100871China

The remarkable uplift of the Tibetan Plateau in the Neogene had great impacts on the climate and environment of East Asia and even the ***,establishment of the Neogene stratigraphic framework of the Tibetan Plateau is of great significance to research in various fields of *** on marine sediments,the international chronostratigraphic system of the Neogene is divided into six stages in the Miocene and two stages in the *** the beginning of the Cenozoic,the share of terrestrial strata on continents has increased *** the Neogene,it had far exceeded that of marine strata,and almost all deposits on the Tibetan Plateau and its surrounding areas were terrestrial *** china,the Miocene includes five stages and the Pliocene includes two *** for the Tunggurian of the Miocene,which has a lower boundary at 15 Ma,the other stages have the same paleomagnetic definitions and time intervals as the corresponding international marine *** fossils play a very important role in the division and correlation of Cenozoic terrestrial strata,and rodent,carnivore,proboscidean,perissodactyl and artiodactyl fossils are especially important in Neogene terrestrial *** are many basins with well-exposed strata and abundant mammalian fossils in the Tibetan *** lower boundary stratotype sections of the Neogene Xiejian and Bahean stages are located respectively in the Xining and Linxia basins,and there are precise paleomagnetic dates in coordination with mammalian *** lower boundary stratotypes of other stages can also be effectively determined in the Tibetan *** first appearing mammalian genera in East Asia also appeared in the Tibetan Plateau and its surrounding areas,especially in the Linxia Basin on the northeast margin and in the Siwaliks on the southwest *** them,Prodeinotherium first appeared at the bottom of the Miocene in the Siwaliks,and the earliest Hipparion of the Old

关键词： Tibetan Plateau Neogene Terrestrial stratum Mammalian fossil Paleomagnetism

Ternary geochemical-tracing system in natural gas accumulation

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Science china earth Sciences 2007年第10期50卷 1494-1503页

作者： LIU WenHui1,2., CHEN MengJin3, GUAN Ping4, zheng JianJing2. JIN qiang5, LI Jian6, WANG WanChun2. HU GuoYi3, XIA YanQing2.& ZHANG DianWei2.1 Exploration & Production Research Institute, SINOPEC, {2. 100083, china 2.Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, china 3 Research Institute of Petroleum Exploration & Production, Petrochina, {2. 100083, china 4 school of earth and space Sciences, peking university, {12., china 5 china university of Petroleum (East china), Dongying 2.7062.,china 6 Longfang Branch, Research Institute of Petroleum Exploration & Production, Petrochina, Longfang 065007, china 1. Exploration & Production Research Institute SINOPEC Beijing 100083 China 2. Key Laboratory of Gas Geochemistry Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou 730000 China 3. Research Institute of Petroleum Exploration & Production PetroChina Beijing 100083 China 4. school of earth and {2. Sciences Peking University Beijing 100871 China 5. china university of Petroleum (East china) Dongying 257062 China 6. Longfang Branch Research Institute of Petroleum Exploration & Production PetroChina Longfang 065007 China

The establishment of geochemical-tracing system of gas generation and accumulation is helpful to re-elucidating the gas migration and accumulation in time and space. To deduce the complex process of gas accumulation, a ternary geochemical-tracing system is set up, according to stable isotope inheritance of source rocks, kinetic fractionation of stable isotopes, time-accumulating effect of noble gas isotopes, mantle-derived volatile inheritance, and organic molecule inheritance of light hydrocarbons and thermally kinetic fractionation in their generation, in combination with the previous achievements of gas geochemistry and geochemical parameters of gas-source correlation. There are tight interactions for the geochemical parameters with much information about parent inheritance and special biomarkers, in which they are confirmed each other, reciprocally associated and preferentially used for the requirement so that we can use these geochemical parameters to effectively demonstrate the sources of natural gas, sedimentary environments and thermal evolution of source rocks, migration and accumulation of natural gas, and rearrangement of natural gas reservoirs. It is necessary for the ternary geochemical-tracing system to predict the formation of high efficient gas reservoir and their distribution in time and space.

关键词： stable isotope, noble gas, light hydrocarbon, tracing system, sources of natural gas

Determining Pressure with Daughter Minerals in Fluid Inclusion by Raman Spectroscopy:Sphalerite as an Example

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Acta Geologica Sinica(English Edition) 2009年第3期83卷 628-632页

作者： YANG Yuping zheng haifei ZHANG Lifei The Key Laboratory of Orogenic Belts and Crustal Evolution MOE School of Earth and Space Sciences Peking University Beijing 100871 China

Raman frequency of some materials, including minerals, molecules and ions, shifts systematically with changing pressure and temperature. This property is often used as a pressure gauge in high pressure experiments with the hydrothermal diamond anvil cell （HDAC）. Since the system of fluid inclusion is similar to that of HDAC, it can also be used to determine the internal pressure of fluid inclusions. Sphalerite is a common daughter mineral. In this study, the frequency shift of the 350 cm-1 peak of sphalerite has been studied from 2.6 to 52. K and from 0.07 to 2.00 GPa using the HDAC. The global slope of the isotherms （V350/p）T is 0.0048 in the studied pressure range. No significant variation of the slopes with temperature has been observed. The correlation between the frequency shift of the 350 cm-1 peak of sphalerite and pressure and temperature is constrained as P=2.8.33（△ Vp）350＋3.13T-943.75. This relationship may be used to estimate the internal pressure of the sphalerite-bearing fluid inclusions.

关键词： pressure fluid inclusion sphalerite Raman

Integrative Neogene stratigraphy, biotas and paleogeographic evolution of the Tibetan Plateau and its surrounding area

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Science china earth Sciences 2023年

作者： Tao DENG Xiaomin FANG qiang LI Shiqi WANG Feixiang WU Sukuan HOU Jiao MA Qigao JIANGZUO Danhui sun Yan {2. Qinqin SHI Boyang sun Lu LI CAS Center for Excellence in Life and Paleoenvironment Beijing Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space Sciences Peking University university of Chinese Academy of Sciences Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau earth Sciences and Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Research Chinese Academy of Sciences

The remarkable uplift of the Tibetan Plateau in the Neogene had great impacts on the climate and environment of East Asia and even the world. Therefore, establishment of the Neogene stratigraphic framework of the Tibetan Plateau is of great significance to research in various fields of geosciences. Based on marine sediments, the international chronostratigraphic system of the Neogene is divided into six stages in the Miocene and two stages in the Pliocene. Since the beginning of the Cenozoic, the share of terrestrial strata on continents has increased rapidly. By the Neogene, it had far exceeded that of marine strata, and almost all deposits on the Tibetan Plateau and its surrounding areas were terrestrial strata. In china, the Miocene includes five stages and the Pliocene includes two stages. Except for the Tunggurian of the Miocene, which has a lower boundary at 15 Ma, the other stages have the same paleomagnetic definitions and time intervals as the corresponding international marine stages. Mammalian fossils play a very important role in the division and correlation of Cenozoic terrestrial strata, and rodent,carnivore, proboscidean, perissodactyl and artiodactyl fossils are especially important in Neogene terrestrial *** are many basins with well-exposed strata and abundant mammalian fossils in the Tibetan Plateau. The lower boundary stratotype sections of the Neogene Xiejian and Bahean stages are located respectively in the Xining and Linxia basins, and there are precise paleomagnetic dates in coordination with mammalian fossils. The lower boundary stratotypes of other stages can also be effectively determined in the Tibetan Plateau. Many first appearing mammalian genera in East Asia also appeared in the Tibetan Plateau and its surrounding areas, especially in the Linxia Basin on the northeast margin and in the Siwaliks on the southwest margin. Among them, Prodeinotherium first appeared at the bottom of the Miocene in the Siwaliks, and the ear

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Determination of inner pressure for fluid inclusions by Raman spectroscopy and its application

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Geoscience Frontiers 2011年第3期2卷 403-407页

作者： haifei zheng Erwei Qiao Yuping Yang Tiyu Duan Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing 100871 China

Using a Diamond Anvil Cell combined with micro Raman spectroscopy, the quantitative relations among Raman shifts, pressure and temperature were obtained for the vibration of O-H in H2.-NaCl, C-O in CO3^2., S-O in SO4^2. and C-H in n-heptane-cyclohexane. Based on the quantitative relationships obtained, it is possible to determine the inner pressure for single fluid inclusions and to further determine the isochore of the systems. It is not only helpful to obtain the forming temperatures and pressures of the enclosing minerals, but also to be able to provide information concerning the chemical compositions of the fluid inclusions.

关键词： Raman spectroscopy Fluid inclusion Inner pressure Isochore line Forming temperature andpressure of minerals

一种耐温抗盐型表面活性剂的制备及其驱油性能评价

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应用化工 2022年第7期51卷 1929-1933,1938页

作者：郑皓轩师永民田雨呼强强赵帅陕西科技大学陕西省轻化工助剂重点实验室陕西西安710021 北京大学地球与空间科学学院北京100871

脂肪醇聚氧乙烯醚和马来酸酐通过酯化反应,合成改性聚醚酯中间体,中间体与α-烯基磺酸钠通过水溶液自由基聚合,合成了一种低聚表面活性剂,对其进行了结构表征,并对抗盐耐温性、表界面张力、润湿性、乳化性以及静态洗油效率等驱油效果进... 详细信息

脂肪醇聚氧乙烯醚和马来酸酐通过酯化反应,合成改性聚醚酯中间体,中间体与α-烯基磺酸钠通过水溶液自由基聚合,合成了一种低聚表面活性剂,对其进行了结构表征,并对抗盐耐温性、表界面张力、润湿性、乳化性以及静态洗油效率等驱油效果进行验证。结果表明,该表面活性剂耐温耐盐性能较好,并且有较好的洗油效果,洗油效率最大增幅可达2.%,在使用质量浓度为0.3%时,可以将界面张力降低到10mN/m;具有较好的润湿性,可以将油岩接触角降低至41°;乳化性能良好,当体系含水率为50%时,2. h析水率仅为60%左右,并可与原油形成稳定乳状液,具有一定在油田应用的价值。

关键词：表面活性剂耐温抗盐乳化性驱油性

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阳离子型聚合物稠化剂的合成与性能评价

应用化工 2023年第4期52卷 1024-1028页

作者：呼强强田雨郑皓轩田浩睿张瑞赵帅师永民陕西科技大学陕西省轻化工助剂重点实验室陕西西安710021 北京大学地球与空间科学学院北京100871

以丙烯酰胺、30%丙烯酰胺/甲叉双丙烯酰胺(2.∶1)、甲基丙烯酰氧乙基三甲基氯化铵、十六/十八烷基二甲基烯丙基氯化铵为主要合成单体,聚合引发剂为水溶性2.2.偶氮二(2.甲基丙基脒)二盐酸盐,合成疏水缔合型阳离子聚合物稠化剂(PASM)。对... 详细信息

以丙烯酰胺、30%丙烯酰胺/甲叉双丙烯酰胺(2.∶1)、甲基丙烯酰氧乙基三甲基氯化铵、十六/十八烷基二甲基烯丙基氯化铵为主要合成单体,聚合引发剂为水溶性2.2.偶氮二(2.甲基丙基脒)二盐酸盐,合成疏水缔合型阳离子聚合物稠化剂(PASM)。对产物进行结构表征及性能测试,结果表明,稠化剂PASM的临界缔合浓度为0.5%,分子量为417.3×104,耐Na+和Ca2.能力强,并且随着矿化度的增加,起初体系的粘度呈现出上升趋势,表现出优异的增稠性能。低浓度使用状态下即可达到较好的防膨效果,悬砂性能优异,经过硫酸铵破胶后无残渣,破胶液不会对地层造成二次伤害,具有广阔的工业化前景。

关键词：疏水缔合阳离子聚合物稠化剂

非离子表面活性剂在黏土矿物表面的吸附规律研究

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应用化工 2023年第9期52卷 2728-2732页

作者：赵帅田雨郑皓轩田浩睿张瑞呼强强晏晓龙师永民陕西科技大学陕西省轻化工助剂重点实验室陕西西安710021 北京大学地球与空间科学学院北京100871

为针对不同地层选取适应性更强的化学剂,减少黏土矿物对表面活性剂的吸附损耗,以脂肪醇聚氧乙烯类表面活性剂为例,采用静态吸附法研究非离子表面活性剂在不同黏土矿物表面的吸附规律,探讨不同EO加成数、不同碳链数、临界胶束浓度和Zeta... 详细信息

为针对不同地层选取适应性更强的化学剂,减少黏土矿物对表面活性剂的吸附损耗,以脂肪醇聚氧乙烯类表面活性剂为例,采用静态吸附法研究非离子表面活性剂在不同黏土矿物表面的吸附规律,探讨不同EO加成数、不同碳链数、临界胶束浓度和Zeta电位对非离子表面活性剂吸附机理的影响。结果表明,在吸附过程中,碳链长度-疏水性-吸附量之间始终为正反馈效果;EO加成数-氢键/疏水性-吸附量之间的关系取决于氢键强度与疏水性强度的关系。优选得出十二烷基醇聚氧乙烯醚-7为抗吸附性较好的非离子表面活性剂,也为三次采油过程中化学剂的选取提供了依据。

关键词：吸附损耗脂肪醇聚氧乙烯醚临界胶束浓度 Zeta电位