Cretaceous Oceanic Red Beds （CORB）, response to paleoclimatic/paleoceanographic global changes and regional tectonics Workshop of IGCP 463 ＆ 494     

Robert W. Scott Chengshan Wang Xiumian Hu 《《幕》》2006,29(1):49-51

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雅鲁藏布江蛇绿岩再研究:从地质调查到矿物记录   总被引：9，自引：0，他引：9  

王成善  李亚林  刘志飞  李祥辉  唐菊兴  REJEAN Hebert  COTE Dubois  VARFALVY V  HUOT F 《地质学报》2005,79(3):323-330

蛇绿岩带出现于全球大多数碰撞构造带上,通常是板块缝合带的标志,西藏雅鲁藏布江缝合带蛇绿岩带对于此种概念模型是毫无争议的。根据近年来现代洋壳和蛇绿岩研究成果以及分析技术,在20世纪80年代中法合作项目研究成果基础上,笔者再次对西起日喀则拉孜、东至泽当金鲁,长约500km的雅鲁藏布江缝合带蛇绿岩进行了研究。在野外调查基础上,对雅鲁藏布江蛇绿岩中500多个尖晶石样品的地球化学特征进行了分析研究,以探讨蛇绿岩的成因及其动力学背景,提出雅鲁藏布江蛇绿岩带属于超俯冲作用(suprasubduction)的产物,与近年来其他研究成果的认识一致。  相似文献   

晚白垩世(80Ma)东亚气候的数值模拟          下载免费PDF全文

陈军明  赵平  王成善  黄永建 《地学前缘》2009,16(6):226

利用美国国家大气研究中心(NCAR)的CCSM2全球气候系统模式以及重建的古地理资料研究了晚白垩世(80Ma)东亚的古气候特征。模拟结果表明:80Ma时期东亚地区大范围盛行的风向和气压系统随季节有显著变化,由此可以推断东亚地区当时是存在季风环流的。与现代气候比较,白垩纪时期大陆上空的大气环流系统经向特征更明显,这种特征可能与当时欧亚大陆东西向跨度较小有关。此外,在当时偏暖的背景下,东亚冬季风和夏季风呈现出一致的变化特征,即冬季风和夏季风都比现代强。年平均降水的分布型和现代的情况比较相似,降水最大值出现在10°S～10°N的赤道辐合带中,与西太平洋相邻的大陆东岸降水也较多,其中心超过1200mm,而在中纬度的内陆地区降水则稀少。虽然与现代情况相似,80Ma在30°N附近的西太平洋上也为多雨带,然而在东亚陆地上没有多雨带,这说明了青藏高原隆升在现代东亚夏季梅雨形成中的重要性。此外,模拟的80Ma时期东亚地区气候要比现代温暖,相同纬度的表面气温要高2℃以上,模拟的温度与地质证据估计的温度比较接近。  相似文献   

Cretaceous Oceanic Redbeds: Implications for Paleoclimatologyand Paleoceanography   总被引：4，自引：0，他引：4  

WANG Chengshan  HUANG Yongjian  HU Xiumian  LI Xianghui State Key Laboratory of Oil/Gas Reservoir Geology  Exploration  Chengdu Universityof Technology  Chengdu  Sichuan  College of Earth Science  Chengdu University of Technology  Chengdu  Sichuan Department of Earth Science  Nanjing University  Nanjing  Jiangsu China University of Geosciences  Beijing 《《地质学报》英文版》2004,78(3):873-877

The Cretaceous is among the most unusual eras in the geological past. Geoscience communities have been having great concerns with geological phenomena within this period, for example carbonate platforms and black shales in the Early and Middle Cretaceous respectively, during the last decades. But few people have paid any attention to the set of pelagic redbeds lying on the black shales, not to mention the applications to paleoclimatology and paleoceanography. It is shown by the sedimentary records of redbeds, that they were deposited around the CCD, with both a higher content of iron and much lower concentrations of organic carbon, which implies conditions with a  相似文献   

酒东盆地营尔凹陷早白垩世断陷形成机制探讨   总被引：1，自引：0，他引：1       下载免费PDF全文

冉波  王成善  朱利东  郑荣才  汪满福  严宝年  刘永昌 《地质科学》2011,(3):826-837

位于青藏高原和华北板块两大构造带交汇处的河西走廊带中西段酒东盆地,早白垩世为典型断陷盆地,但对其断陷形成机制存在明显争议.因早白垩世两大构造带的主体构造作用明显差异:北—南向挤压和北西—南东向伸展,为深入了解哪一种作用是控制早白垩世酒东盆地形成的主要因素,本研究特选取远离新生代强烈活动的阿尔金断裂带,在河西走廊带中西段...  相似文献   

西藏南部江孜地区白垩系的厘定   总被引：32，自引：3，他引：29  

王成善  万晓樵 《地质学报》2000,74(2):97-107

文中对藏南江孜地区深海一次深海白垩纪地层层序、系统及厚度进行了厘定。建组剖面甲不热、维美等构造复杂,地层层序变化大,重复多。厘定后的岩石层单元有加不拉组、床得组和宗卓组。加不拉组是一套以黑色页岩为主的地层,跨不白垩统一上白垩统三冬阶,下分黑层段和白层段;床得组由紫红色页片状泥灰岩组成,各坎潘期早－中期;宗且即著名的“北家混杂堆积岩”,页岩中含大量外来岩块,时代为坎潘期晚期和马斯特里赫特期。白垩系厚  相似文献   

http://www.sciencedirect.com/science/article/pii/S1674987112000035     

Xiang Gao  Pingkang Wang  Dairong Li  Qiang Peng  Chengshan Wang  Hongwen Ma 《地学前缘(英文版)》2012,3(5):669-680

The well SK-I in the Songliao Basin is the first scientific borehole targeting the continental Cretaceous strata in China.Oval concretions,thin laminae and beds of dolostone are found intercalated within mudstone and organic-rich black shale in the Nenjiang Formation of Campanian age.Low ordered ferruginous dolomite is composed of euhedral-subhedral rhombs with cloudy nucleus and light rims formed during the diagenesis.which are typical features of replacement.The heavy carbon isotopes (δ¹³C_PDB-1.16-16.0) are results of both the fermentation of organic matter by microbes and degassing of carbon dioxide during the period of diagenesis,and the presence of light oxygen isotopes(δ¹⁸O_Pdb- 18.53～-5.1) is a characteristic feature of fresh water influence which means the carbonate may have been altered by ground water or rainwater in the late diagenesis.Marine water incursions into the normally lacustrine basin have been proved by both the salinity of Z value and the occurrence of foraminifera in the same strata where dolomite occurs.Pyrite framboids observed by SEM are usually enclosed in the dolomite crystals or in the mudstones,supporting the sulfate reducing bacteria（SRB）.The formation of both dolomite and pyrite are associated with marine water incursions,which not only supply magnesium ion for dolomite,but also result in limited carbonate precipitation in the basin.The presence of pyrite tramboids indicates the development of an anoxic environment associated with salinity stratification in the lake.The dolomite in the Nenjiang Formation is the results of marine water incursions,diagenetic replacement of calcareous carbonate and sulfate reducing bacteria（SRB）.  相似文献   

Late Cretaceous chronostratigraphy （Turonian-Maastrichtian）： SK1 core Songliao Basin, China   总被引：1，自引：0，他引：1  

Robert W. Scott  Xiaoqiao Wan  Chengshan Wang  Qinghua Huang 《地学前缘(英文版)》2012,3(4):357-367

Non-marine ostracodes,charophytes and palynomorphs are abundant in most Cretaceous lacustrine basins of East Asia.However,their ranges are not directly integrated with marine biota that defines the Cre...  相似文献   

Petrologic characteristics and genesis of dolostone from the Campanian of the SK-Ⅰ Well Core in the Songliao Basin,China     

Xiang Gao  Pingkang Wang  Dairong Li  Qiang Peng  Chengshan Wang  Hongwen Ma 《地学前缘(英文版)》2012,3(5)

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土壤次生碳酸盐碳氧稳定同位素古环境意义及应用   总被引：9，自引：1，他引：9  

黄成敏  王成善  艾南山 《地球科学进展》2003,18(4):619-625

土壤次生碳酸盐碳氧稳定同位素特征是反映古气候与古环境的重要代用指标,其碳氧稳定同位素组成分别受土壤CO2中C同位素组成和大气水的O同位素控制。在一定深度的土壤中,土壤次生碳酸盐δ^13C就主要受当地植物类型(C3植物和C4植物等)控制。土壤次生碳酸盐样预处理中剔除土壤中原生碳酸盐以及有机物污染尤为重要。土壤中次生碳酸盐C、O稳定同位素地球化学在土壤发生学、古气候恢复、古生态重建以及全球变化研究中应用日益广泛,但解译时可能受应用年代范围、成岩作用、原生和次生碳酸盐混杂、土壤碳酸盐多元发生等因素影响,其应用机理和范围还需进一步探讨。  相似文献