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Geochemical and Mineral Characteristics of Jurassic Volcanic Rocks from ODP Sites 304, 1149, and 801:Implications for Magmatic Evolution in the Northwest Pacific

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Acta Geologica Sinica(English Edition) 2018年第3期92卷 915-934页

作者： CHEN Shuangshuang LIU Jiaqi patrick rioual GUO Zhengfu Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Institutions of Earth Science Chinese Academy of Sciences

The regular variations in magmatic activities along the Northwest Pacific plate have been little studied in spite of their importance. In this contribution, systematic analyses were conducted on tholeiitic basalts from three Ocean Drilling Program sites(Sites 304, 1149, and 801), including the petrographic features, major and trace elements, Nd isotopic compositions, and mineral structure and compositions of whole rocks. Volcanic rocks from Sites 304, 1149, and 801 belong to tholeiites and exhibit depleted light rare earth elements(LREE), large ion lithophile elemental contents(LILE), and relatively depleted Nd isotopic ratios(143Nd/144Nd=0.513139-0.513211), similar to those of normal mid-ocean ridge basalts(NMORB). Comprehensive data on mineral compositions, whole-rock geochemistry, and geochronology demonstrate that a regular variation trend exists in the north-south direction along the Northwest Pacific plate. The 143 Nd/144 Nd values(0.513139-0.513211) and trace-element ratios for whole rocks(Sm/Th=15.35-30.00; Zr/Hf=28.53-35.76; Zr/Y=2.58-3.67; Th/La=0.04-0.06; Th/Y=0.33-0.70), as well as the trace-element ratios(Zr/Hf, La/Yb, Ti/Zr) of clinopyroxenes from Sites 1149 and 801 tholeiites show larger variations compared to those from Site 304 tholeiites(143Nd/144Nd=0.513185-0.513195; Sm/Th=18.19-20.58; Zr/Hf=31.07-33.26; Zr/Y=2.62-3.03; Th/La=0.05-0.06; Th/Y=0.48-0.57). Mineral zoning textures were obvious in tholeiites from Sites 1149 and 801 but were rarely observed in Site *** regular features were likely attributed to the differences in the heterogeneity of the magma source,the process of magmatic evolution, the plate-spreading rate, and the effective and ineffective mixing.

关键词： tholeiite zoning texture Ocean Drilling Program plate spreading rate Northwest Pacific

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Study of the varve record from Erlongwan maar lake, NE China, over the last 13 ka BP

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Chinese Science Bulletin 2008年第2期53卷 262-266页

作者： YOU HaiTao LIU JiaQi LIU Qiang CHU GuoQiang patrick rioual HAN JingTai Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China College of Earth Sciences Jilin University Changchun 130061 China

在来自跨越最后 13 ka BP 的 Erlongwan maar 湖的一个沉积序列，二种主要纹泥类型能被认出：源於生物的纹泥(从礼品到 -11.2 ka BP， 0-632 厘米) 并且碎屑状的纹泥(从 -11.2 到 -12.7 ka BP， 632-700 厘米) 。基于在沉积包含的水藻... 详细信息

在来自跨越最后 13 ka BP 的 Erlongwan maar 湖的一个沉积序列，二种主要纹泥类型能被认出：源於生物的纹泥(从礼品到 -11.2 ka BP， 0-632 厘米) 并且碎屑状的纹泥(从 -11.2 到 -12.7 ka BP， 632-700 厘米) 。基于在沉积包含的水藻的主导的类型，源於生物的纹泥能被分类进 dinocyst 源於生物的纹泥(0-63 厘米) 并且混合(dinocyst 和硅藻) 源於生物的纹泥(214-632 厘米) 。在这篇论文，纹泥的形成过程和部件被描述，为纹泥在整个记录变化的类型的可能的原因被讨论，一张高分辨率的纹泥年表被建立跨越最后 13 ka BP。尽管进一步的纹泥数和错误评价被需要，这里介绍的结果为学习 Erlongwan maar 湖的 palaeoclimate 记录代表一个稳固的基础。

关键词：生物纹泥碎屑状纹泥腰鞭毛虫纹泥年代学

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Diatom Response to Global Warming in Douhu Lake,Southeast China

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 638-647页

作者： LI Jingjing WANG Luo CAO Qi patrick rioual LEI Guoliang CAI Binggui ZHANG Jiaoyang ZOU Yafei YAN Yao WAN Xiaoqiao XIAO Jule School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China School of Geographical Sciences Fujian Normal UniversityFuzhou 350007China CAS Center for Excellence in Life and Paleoenvironment Beijing 100044China Key Laboratory of Humid Subtropical Ecogeographical Processes of the Ministry of Education Fujian Normal UniversityFuzhou 350007China Institute of Geography Fujian Normal UniversityFuzhou 350007China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

A large number of lacustrine sedimentary records indicate that global warming is the main factor leading to significant changes in diatom communities in lakes of the northern ***,due to the intensification of human activities since 1850,some scholars have emphasized that the increasing lake trophic level may be the main reason for the changes in diatom *** debate is *** order to avoid falling into the complex relationship between diatom changes and the seasonal cycle that characterizes lakes in mid and high latitudes,we chose a lake located at a low latitude,where the relationship between diatoms and temperature is not indirect but *** diatom record spans the past ca.100 years and reveals that the abundance of Aulacoseira granulata increased from 1900 until 1985,replacing the previously dominant Aulacoseira *** changes are in agreement with the increasing trend in global *** 1985,the percentages of the small-celled Discostella stelligera and the benthic diatom Navicula heimansioides have increased,while Aulacoseira granulata has *** latest shift is caused by further global *** conclude that warming is the main factor leading to changing diatom communities in Douhu Lake.

关键词： diatom global warming Douhu Lake China

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Study of the varve record from Erlongwan maar lake,NE China,over the last 13 ka BP

Study of the varve record from Erlongwan maar lake,NE China,...

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中国科学院地质与地球物理研究所2008学术年会

作者： patrick rioual Institute of Geology and Geophysics Chinese Academy of Sciences

In a sediment sequence from Erlongwan maar lake that spans the last 13 ka BP,two main varve types can be recognized:biogenic varves(from the present to～11.2 ka BP,0—632 cm) and clastic varves (from～11.2 to～12.7 ka BP,632—700 cm).Based on the dominant types of algae contained in the sediment,the biogenic varves can be classified into dinocyst-biogenic varves(0—63 cm) and mixed (dinocyst and diatom)-biogenic varves(214—632 cm).In this paper,the formation process and components of the varve are described,the possible reason for the types of varve changing throughout the record is discussed and a high-resolution varve chronology is established spanning the last 13 ka BP. Although further varve counting and error assessment are needed,the results presented here represent a solid foundation for studying the palaeoclimate record of Erlongwan maar lake.

关键词： biogenic varve clastic varve dinocyst varve chronology

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Holocene aeolian stratigraphic sequences in the eastern portion of the desert belt(sand seas and sandy lands) in northern China and their palaeoenvironmental implications

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Science China Earth Sciences 2019年第8期62卷 1302-1315页

作者： Xiaoping YANG Peng LIANG Deguo ZHANG Hongwei LI patrick rioual Xulong WANG Bing XU Zhibang MA Qianqian LIU Xiaozong REN Fangen HU Yuxin HE Gang RAO Ninghua CHEN Department of Geography School of Earth SciencesZhejiang UniversityHangzhou310027China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an710061China Institute of Chinese Historical Geography Fudan UniversityShanghai200433China School of Geography Taiyuan Normal UniversityTaiyuan030619China College of Teachers’Education Yichun UniversityYichun336000China Department of Geology School of Earth SciencesZhejiang UniversityHangzhou310027China

This paper presents the environmental history and its responses to palaeoclimatic changes since the start of the Holocene in the eastern portion of the desert belt(sand seas and sandy lands) in northern China by comparing the aeolian sandpalaeosol sequences and their palaeoclimatic proxies. The optically stimulated luminescence(OSL) ages of the aeolian sandpalaeosol sedimentary sequences and a series of palaeoenvironmental proxies show that:(1) The large-scale dune landscape currently in the Kubuqi Sand Sea was formed during the Holocene in general;and the palaeosol was generally developed during the period of 4–2 ka, indicating conditions favorable for vegetation growth, soil development, and organic carbon accumulation due to increased precipitation or effective moisture and weakened aeolian activities;the large-scale expansion of dunes in the recent 2 ka is closely linked to human activities. The variable discharge of the Yellow River with diversions for irrigation may have resulted in a more consistent supply of aeolian particles for dune field expansion.(2) The dune landscape of the Hunshandake Sandy Land was likely formed around 12 ka, and before this, the western part of the Hunshandake Sandy Land would have been covered by a single large lake;it was obviously wetter than today in the sandy land during the period of 9.6–3 ka and the palaeosols were developed at the same time. But the aeolian activities have not been completely dormant in this long-lasting wetter epoch;because the Holocene wetter period was likely time-transgressive across the region.(3) The palaeosol of the Hulunbuir Sandy Land began to develop as early as 14.5 ka, probably continuing until the last 2 ka. The palaeosol development of various dune fields in the eastern portion of the desert belt(sand seas and sandy lands) in northern China is spatially heterogeneous, and even the palaeosol development time in different locations within each sandy land is inconsistent. During the middle Holocen

关键词： Sand sea Sandy land,Environmental evolution,Kubuqi,Hunshandake,Hulunbuir

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Dinocyst microlaminations and freshwater“red tides”recorded in Lake Xiaolongwan,northeastern China

Dinocyst microlaminations and freshwater“red tides”recorde...

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中国科学院地质与地球物理研究所2008学术年会

作者： patrick rioual Andres Boltovskoy Institute of Geology and Geophysics Chinese Academy of Sciences

We reported a special type of lamination formed in the sediments of Lake Xiaolongwan, northeastern *** lamination consists of light-and brown-colored laminate couplets in the thin *** brown-colored layer is composed mainly of dinoflagellate *** grey-colored layer consists of other organic and siliceous matter(plant detritus,diatoms,chrysophyte cysts) and clastics. Preliminary sediment trap results show that a distinct peak of dinocyst flux occurred in *** dinocyst flux maximum also corresponds to the peaks of diatom flux and chrysophyte stomatocyst flux. These suggest that "red tide blooms" occur in this freshwater *** speculate that the dinocyst flux maximum could be related to autumn overturn due to increased nutrients,and the availability of cysts for germination from the lake ***,it may also reflect increasing dissolved organic matter after leaf *** independent chronology derived from Cs and Pb shows a good agreement with counted *** the sediment trap data and the independent chronology data,the dinocyst mi-crolaminae appear to be annually laminated,and probably could be called dinocyst *** vegetative(thecate stage) cells of Peridinium volzii and Ceratium furcoides are found in the water samples,it is not possible to relate the dinocysts to these two dinoflagellate *** on morphological and ecological analyses,we suggested that they have affinities with species of Peridinium(sensu lato),most probably to *** investigations should be carried out to understand the red tide history in this freshwater *** laminated dinocyst microlayers in freshwater and marine sediments not only provide an uncommon archive for understanding the history of red tides and harmful algal blooms,and why and how certain species periodically bloom over several thousands years,but also provide important records of paleo-environmental and paleoclimatic changes at seasonal to an

关键词： Dinocyst microlamination Sediment trap Dinocyst flux Radiometric dating Red tide history

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Formation and evolution of sand deserts in Xinjiang, Northwest China：II. The palaeo-environmental reconstruction

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Journal of Geographical Sciences 2014年第3期24卷 539-559页

作者： ZHU Bingqi YU Jingjie QIN Xiaoguang patrick rioual ZHANG Yichi XIONG Heigang Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics CAS Beijing 100029 China Key Laboratory of Oasis Ecology Ministry of Education Urumqi 830046 China

Based on the palaeoclimatic and palaeoenvironmental evidences of geological history and human history periods, this paper reviews the researches and progresses on the development of the sandy deserts in Xinjiang. It pointed out that the features of tectonic structure in Xinjiang had made both the Tarim Basin and the Junggar Basin being influenced greatly by the foehn effects originated from the planetary wind system of westerly, the East Asian ocean-continental monsoon and the topographical mountain-valley winds. The regional patterns of climate and environment since the Quaternary were characterized by the overall persistent drought accompanied by fluctuations in the secondary scale. Formations of aeolian sediments in the basins and at the margins are a potential response to global climate change, particularly the aridification of the Asian hinterland deduced by the uprising of the Tibetan Plateau and its surrounding highlands. For the question about the formation time of the Tak- lamakan Desert, because the research methods, objects and information carriers used in previous studies are different, there are many disputes in the academic circles at present. Evidences from aeolian deposits/rocks at the edge and in the hinterland of these sandy de- serts and their chronological data indicate that an arid climate and land surface aeolian processes have occurred at the edge of the Tarim Basin and its hinterland areas since the Tertiary period. However, the duration time of these processes at mass scale should have begun after the middle Pleistocene and lasted to the Holocene. Occurrence of dune fields in recent 2000 years in the oasis areas should be greatly influenced by human factors.

关键词： sandy desert Tertiary Quaternary ancient aeolian sediment palaeoclimate change Xinjiang

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Formation and evolution of sand deserts in Xinjiang, Northwest China： I. Provenances of desert sands

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Journal of Geographical Sciences 2014年第1期24卷 177-190页

作者： ZHU Bingqi YU Jingjie QIN Xiaoguang patrick rioual LIU Ziting XIONG Heigang Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics CAS Beijing 100029 China Key Laboratory of Xinjiang Oasis Ecology Ministry of Education Urumqi 830046 China

Sandy desert landscape is a geological product of arid climate and abundant sand materials supply in natural conditions, therefore the formation of sandy desert is an ideal studying object for understanding the interaction between various stratigraphic/epigenetic spheres of the earth system. However, until now, the knowledge about the provenance and formation of these deserts in Xinjiang, Central Asia is diverse and inconsistent, a systematic review is necessary. Ancient aeolian sand sediments in the internal areas of these deserts and their twin dust deposits in the Cenozoic strata surrounding the Xinjiang deserts are direct and indirect clues reflecting the provenance of sand materials and the formation and evolution of deserts. Based on the geochemical, mineralogical and isotopic evidences of desert sands and relevant deposits in the peripheral regions, this paper reviews the research progress on the development of the sandy deserts in Xinjiang, Northwest China. Many proofs proposed that desert sands in Xinjiang were mainly sourced from the ancient pluvial, alluvial and fluvial sediments and were eventually achieved because of the local sand supply. It pointed out that the settings of tectonic structure in Xinjiang had made sediments both in the Tarim Basin and the Junggar Basin being influenced greatly by regional hydrological system and aeolian processes originated from the planetary wind system of westerly, the East Asian winter monsoon and the topographical mountain-valley winds. However, the directions of transpor- tation paths are different between the hydrological dynamics and the aeolian dynamics, which are decided by the slantwise structures of the basins tectonics and the regional atmospheric circulation routes, respectively, and have determined anisotropies of the transport pathway of these sediments delivered by different agents. This results in a geological cycle of detrital sediment transportation in the two large sediment mixing, alternation and re

关键词： sandy desert provenance hydrodynamic and aeoliandynamic agents sediment transportation Xinjiang

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晚更新世以来塔克拉玛干沙漠中部地区的环境演变

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科学通报 2021年第24期66卷 3205-3218页

作者：杨小平杜金花梁鹏张德国陈波 patrick rioual 张峰李鸿威王旭龙浙江大学地球科学学院浙江省地学大数据与地球深部资源重点实验室杭州310027 长安大学地球科学与资源学院西安710064 中国科学院地质与地球物理研究所中国科学院新生代地质与环境重点实验室北京100029 新疆大学资源与环境科学学院乌鲁木齐830046 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室西安710061

选取塔克拉玛干沙漠中西部南-北大断面为考察路线,综合运用第四纪地质学、地貌学等学科的研究方法,对9个河流-湖泊(及静水)-风沙沉积地层的古环境特征进行了解析和探讨.目前这些剖面都处于风沙环境,但保存的古河流沉积和湖泊(静水)沉积... 详细信息

选取塔克拉玛干沙漠中西部南-北大断面为考察路线,综合运用第四纪地质学、地貌学等学科的研究方法,对9个河流-湖泊(及静水)-风沙沉积地层的古环境特征进行了解析和探讨.目前这些剖面都处于风沙环境,但保存的古河流沉积和湖泊(静水)沉积暗示这些区域都曾是河流所到之处或较长时间被水体淹没.通过光释光测年方法对河流和湖泊的起始时间进行了界定;选取颜色、粒度和磁化率等代用指标明确古环境意义.古环境代用指标值与野外沉积相的判断结果基本一致,河流和风沙沉积的粒度较湖相沉积为粗,磁化率总体较低,湖相沉积的碳酸钙含量较高.研究区河流和湖相沉积的持续时间说明,塔克拉玛干沙漠自晚更新世以来至少经历过3个相对比较湿润的时段,即约70~50 ka、末次冰期冰消期(约17~11 ka)和全新世晚期(约5~2 ka).对比分析表明,塔克拉玛干沙漠的古环境演变过程和机制与中国北方地区其他沙漠、沙地存在显著区别.

关键词：沙漠地貌学第四纪环境演变光释光测年

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Stauroneis lacusvulcani ***.(Bacillariophyceae),a new diatom from volcanic lakes in northeastern China

Stauroneis lacusvulcani ***.(Bacillariophyceae),a new diatom...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： patrick rioual QIANG GAO YUMEI PENG GUOOIANG CHU Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of Sciences

Stauroneis lacusvulcani *** described from two small volcanic lakes in northeastern *** morphology of 5. lacusvulcani is illustrated with light and scanning electron micrographs and discussed in comparison with several species of the Stauroneis gracilior *** can be distinguished by the size of the valves and its long-protracted and strongly capitate *** analysis of the sedimentary record from Lake Xiaolongwan(Jilin Province) showed that this new species was most abundant during the early Holocene(-8950 to 10,640 yrs BP).

关键词： China morphometric analysis new species palaeolimnology Stauroneis

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