| 青藏高原五道梁地区中新世湖相叠层石特征、分类及古气候意义 |
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| 引用本文： | 曾德勇,时志强,张华,王艳艳,刘辉伦,田江飞.青藏高原五道梁地区中新世湖相叠层石特征、分类及古气候意义[J].矿物岩石,2011,31(3). |
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| 作者姓名： | 曾德勇 时志强 张华 王艳艳 刘辉伦 田江飞 |
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| 作者单位： | 成都理工大学沉积地质研究院,四川成都,610059 |
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| 基金项目： | 国家自然科学基金(40872082) |
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| 摘 要： | 通过对青藏高原五道梁地区中新世湖相叠层石样品岩石薄片、扫描电镜的观察,发现叠层石纹层主要有层带状、波状和柱状3种形态,且明暗纹层的结构极不相同,富屑层颗粒结构明显,富藻纹层由致密状含有机质泥晶方解石构成,呈泥晶结构;在此基础上,对叠层石进行了成因分类,认为研究区发育骨架叠层石、凝集叠层石和细粒叠层石。综合叠层石的沉积学、矿物学和稳定C,O同位素值特征,认为叠层石沉积期气候湿润,而纹层层偶则形成于呈季节性变化的气候条件下,亮层代表湿润期,暗层形成于相对干旱期。
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| 关 键 词： | 湖相叠层石 中新世 纹层 青藏 同位素 |
CHARACTERS AND CLASSIFICATION OF MIOCENE LACUSTRINE STROMATOLITES IN WUDAOLIANG AREA,NORTHERN TIBETAN PLATEAU:IMPLICATIONS FOR PALEOCLIMATE |
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| ZENG De-yong,SHI Zhi-qiang,ZHANG Hua,WANG Yan-yan,LIU Hui-lun,TIAN Jiang-fei.CHARACTERS AND CLASSIFICATION OF MIOCENE LACUSTRINE STROMATOLITES IN WUDAOLIANG AREA,NORTHERN TIBETAN PLATEAU:IMPLICATIONS FOR PALEOCLIMATE[J].Journal of Mineralogy and Petrology,2011,31(3). |
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| Authors: | ZENG De-yong SHI Zhi-qiang ZHANG Hua WANG Yan-yan LIU Hui-lun TIAN Jiang-fei |
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| Institution: | ZENG De-yong,SHI Zhi-qiang,ZHANG Hua,WANG Yan-yan LIU Hui-lun,TIAN Jiang-fei Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China |
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| Abstract: | According to the observation of thin section and SEM,3 types of shape patterns of Miocene lacustrine stromatolite laminations,occurred in Wudaoliang area,Tibetan Plateau,are recognized,they are strip-shaped,ripple-shaped and column-shaped respectively.The texture of stromatolite laminations is extremely different,such as grain-rich layers(light layers) show clear granular texture,while algae-rich layers are made of high content of organic matters with micrite texture.The stromatolites in Wudaoliang area may... |
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| Keywords: | lacustrine stromatolites Miocene laminae Tibetan Plateau isotope |
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