| 塔里木盆地柯坪地区中寒武统藻白云岩去白云岩化研究 |
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| 引用本文： | 王小林,胡文碹,钱一雄,张军涛,谢小敏,李庆. 塔里木盆地柯坪地区中寒武统藻白云岩去白云岩化研究[J]. 矿物学报, 2009, 29(1): 56-62 |
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| 作者姓名： | 王小林 胡文碹 钱一雄 张军涛 谢小敏 李庆 |
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| 作者单位： | 南京大学地球科学系,江苏南京,210093;中国石油化工股份有限公司西北油田分公司勘探开发研究院,新疆,乌鲁木齐830011 |
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| 基金项目： | 国家科技部基础研究发展规划(973)项目(编号2005CB422103) |
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| 摘 要： | 对塔里木盆地柯坪地区中寒武统去白云岩化现象进行了研究。去白云岩化限于渗透性较好的藻白云岩,并且只有靠近含膏层段的藻白云岩才发生去白云岩化。从微观上看,发生去白云岩化的藻灰岩与藻灰云岩含有明显的去白云岩化交代残余,白云石残余呈碎斑状或树枝状。树枝状白云石残余含有大量的方解石包裹体,同时具有较高的Ca/Mg比,为高钙白云石,去白云岩化较彻底,形成藻灰岩;碎斑状白云石残余成分较均一,接近化学计量白云石(Ca/Mg比接近1),去白云岩化程度较弱,形成藻灰云岩。藻灰云岩的δ18O值(平均值为-6.7‰)明显低于邻近的白云岩(平均值为-5.3‰),同时高于藻灰岩(平均值为-9.5‰)。与未发生去白云岩化的藻白云岩相比,藻灰岩与藻灰云岩的孔隙度要明显降低。
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| 关 键 词： | 藻白云岩 去白云岩化 大气淡水 中寒武统 塔里木盆地 |
DEDOLOMITIZATION OF ALGAL DOLOMITES OF MIDDLE CAMBRIAN, KEPING AREA, TARIM BASIN |
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| WANG Xiao-lin,HU Wen-xuan,QIAN Yi-xiong,ZHANG Jun-tao,XIE Xiao-min,LI Qing. DEDOLOMITIZATION OF ALGAL DOLOMITES OF MIDDLE CAMBRIAN, KEPING AREA, TARIM BASIN[J]. Acta Mineralogica Sinica, 2009, 29(1): 56-62 |
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| Authors: | WANG Xiao-lin HU Wen-xuan QIAN Yi-xiong ZHANG Jun-tao XIE Xiao-min LI Qing |
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| Affiliation: | 1. Department of Earth Sciences;Nanjing University;Nanjing 210093;China;2. SINOPEC Northwest Oil Field Branch;Urumqi 830011;China |
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| Abstract: | The dedolomitization of algal dolomite of Middle Cambrian in the Keping area,Tarim Basin,is firstly reported in this work.Dedolomitization occurred only in the algal dolomite which has a high porosity,and only those algal dolomites which are adjacent to the gypsum sequences were dedolomitized.Dolomite residues can be found in the algal limestone and algal calcareous dolomite under BSE images,and they can be divided to two groups:arborization and mortary dolomite residues.The former has plenty of calcite inc... |
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| Keywords: | algal dolomite dedolomitization meteoric water Middle Cambrian Tarim Basin |
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