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| 1 | Dolomitization of the Ordovician subsalt Majiagou Formation in the central Ordos Basin,China:fluid origins and dolomites evolution显示文摘The Middle Ordovician subsalt Majiagou Formation in the Ordos Basin comprises pervasively dolomitized shallow marine limestone and is a major reservoir rich in natural gas resources.Four types of dolomite matrix and cement were identified based on petrographic textures:(very)finely crystalline,non-planar to planar-s matrix dolomite(Md1);finely to medium crystalline,planar-s to planar-e matrix dolomite(Md2);microbialites comprising dolomite microcrystals(Md3);and finely to coarsely crystalline dolomite cement(Cd).The Md1 and Md2 dolomites were controlled by alternating lagoon-shoal facies and haveδ13C values(−1.89 to+1.45‰VPDB for Md1,−1.35 to+0.42‰VPDB for Md2)that fall within or are slightly higher than the coeval seawater,suggesting the dolomitizing fluid of evaporated seawater.Md2 dolomite was then subjected to penecontemporaneous karstification by meteoric water and burial recrystallization by sealed brines during diagenesis,as indicated by its relatively lowerδ18O values(−8.89 to−5.73‰VPDB)and higher 87Sr/86Sr ratios(0.708920–0.710199).Md3 dolomite comprises thrombolite and stromatolite and is interpreted to form by a combination of initial microbial mediation and later replacive dolomitization related to evaporated seawater.Cd dolomite was associated with early-formed karst system in the Md2 host dolomite.The lowestδ18O values(−11.78 to−10.18‰VPDB)and 87Sr/86Sr ratios(0.708688–0.708725)and fluid inclusion data(Th:123–175°C)indicate involvement of hydrothermal fluid from which the Cd dolomite precipitated during deep burial.These results reveal the multi-stage dolomitization history of the Majiagou Formation and provide new constraints on fluid origins and dolomites evolution during deep burial in old superimposed basins,such as the Ordos Basin and elsewhere. | Ying Xiong Li-Chao Wang Xiu-Cheng Tan Yun Liu Ming-Jie Liu Zhan-Feng Qiao | 2021 | Petroleum Science2021，18，2： | 0 |
| 2 | 鄂尔多斯盆地南部二叠系砂岩碎屑锆石年代学特征及地质意义显示文摘陆源碎屑岩物质来源及变化与沉积盆地及构造演化密切相关。通过对鄂尔多斯盆地南部铜川地区晚古生代二叠系山西组、石盒子组及石千峰组砂岩样品岩石薄片鉴定、定量矿物学分析以及碎屑锆石U-Pb年代学分析,结合古流向特征,对物源进行了追溯,并讨论了盆地南部二叠系的构造—沉积过程。研究结果表明,早二叠世山西组碎屑锆石年龄具364 Ma、450 Ma、946Ma和2446 Ma四个主要峰值;中二叠世下石盒子组碎屑锆石年龄具294 Ma、1963.4 Ma和2499 Ma三个主要峰值;晚二叠世石千峰组碎屑锆石年龄主要峰值出现在1876.5 Ma,缺乏北秦岭造山带的新元古代和早古生代碎屑锆石记录。分析认为山西组主要物源区为北秦岭造山带,次要物源区为华北南缘构造带;石盒子组物源由北秦岭造山带、华北板块南缘构造带和内蒙古隆起西段共同提供;石千峰组物源区为华北南缘构造带。早二叠世山西期,华北南缘隆起幅度较低,不影响北秦岭造山带供源。石盒子期,勉略洋由被动拉张转换为主动挤压,秦岭造山带处于持续隆升状态,并造成了华北南缘构造带的不断抬升。石千峰期华北南缘强烈隆升,在为铜川地区提供物源的同时也阻挡了北秦岭造山带的物质进入研究区。结合铜川地区二叠系物源分析结果与周缘锆石数据对比发现,鄂尔多斯盆地南部自东向西先后隆起,这种时间上的差异可以反映华北板块和扬子板块在二叠纪自东向西剪刀式闭合碰撞的启动过程,以及由此所导致的古地形和物源体系的演变。 | 王峰 刘新社 赵伟波 张雷 虎建玲 田景春 陈蓉 王集 吴静仪 肖云霄 | 2023 | 沉积学报2023，41，5： | 0 |
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