Geochemistry and evolution of dolomitizing fluids of the Upper Cambrian-Lower Ordovician dolostones in Central Uplift, Tarim Basin
Huang Qingyu1, Liu Wei1, Zhang Yanqiu2, Shi Shuyuan1, Wang Kun1
1 Research Institution of Petroleum Exploration & Development,PetroChina,Beijing 100083; 2 Institute of Petroleum Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000,Xinjiang
Abstract：Based on the detailed petrology study as well as isotope data (δ13C,δ18O and 87Sr/86Sr),the evolution of dolomitizing fluids and genetic mechanism of the Upper Cambrian-Lower Ordovician dolostones are investigated in the Central Uplift,Tarim Basin.The results indicate that:The Upper Cambrian dolostones are composed of micritic dolostones,microbial dolostones and(relict)grainy dolostones with well-preserved precursor lithologic fabric. These dolostones have similar δ13C values and 87Sr/86Sr ratios to the coeval seawater and slightly higher δ18O values,suggesting that the dolomitization occurred during the penecontemporaneous period and the dolomitizing fluid was associated with the slightly evaporitic seawater. The Lower Ordovician dolostones are mainly comprised of fine-crystalline,planar-euhedral to subhedral dolomites. Poor-preserved precursor texture,similar δ13C values and 87Sr/86Sr ratios to the coeval seawater as well as slightly depleted δ18O values of the dolostone indicated the dolomitization occurred during shallow burial. Some of the dolostones formed in early stage could be altered to fine-coarse crystalline,nonplanar-anhedral dolostones and rift-cavity-filling saddle dolostone cements through recrystallization and tectonically controlled hydrothermal dolomitization during medium to deep burial. The dolomitizing fluids of the burial dolomitization were derived from remnant seawater preserved in the formations,deep mantle hydrothermal fluids and hot brine water in the underlying Middle Cambrian evaporate rocks. These dolostones formed during burial have wide range of 87Sr/86Sr ratios and obviously more negative δ18O values due to the combined impact of multi-stage and multi-source diagenetic fluids. Generally,these dolostones in the study area formed in multiple stages of dolomitization with the tendency of forming in early period(large scale replacement during near-surface and shallow burial),being mature in middle diagenetic stage (partly recrystallization during medium-deep burial)and modified in late diagenetic stage(partial adjustment of hydrothermal fluid).
基金资助:国家科技重大专项(编号:2011ZX05004)和中国石油天然气股份有限公司重大科技专项(编号:2014E-3201)共同资助; [Co-funded by the National Science and Technology Major Project(No.2011ZX05004)and PetroChina Science and Technology Major Project(No.2014E-3201)]
Huang Qingyu,Liu Wei,Zhang Yanqiu et al. Geochemistry and evolution of dolomitizing fluids of the Upper Cambrian-Lower Ordovician dolostones in Central Uplift, Tarim Basin[J]. JOPC, 2016, 18(4): 661-676.
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