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Characteristics and genetic mechanism of the Mesoproterozoic rift system,Ordos Basin,China
2024年
The Mesoproterozoic rifts are developed in the Ordos Basin located in the western margin of the North China Plate.Based on the latest 3D seismic data and previous research results,this study intends to discuss the zonal differential deformation characteristics and genetic mechanism of the Mesoproterozoic rifts in the Ordos Basin.NE-trending rifts are developed in the Mesoproterozoic in the south-central Ordos Basin,the main part of which are located near the western margin of the North China Plate.NNW-trending rifts are developed in the north of the basin,while NW-NNW rifts in the Mesoproterozoic in Hangjinqi area.The genetic mechanism of the Mesoproterozoic rifts is related to regional extensional stress field,plate boundary conditions and internal preexisting structures.The main extensional stress direction strikes NWW-SSE(120°)in the western margin of the North China Plate,based on the forward rift trend of the northern Mesoproterozoic.In Hangjinqi area,the reactivation of the existing NWtrending Wulansu fault and NW-NW-trending Daolao fault,results in dextral shear stress field.The boundary between the western margin of the North China Plate and its adjacent plates forms a nearly NS-trending preexisting basement tectonic belt,which intersects with the NWW-SSE(120°)extensional stress at an acute angle of 60°.Therefore,the western margin of the North China Plate is formed by oblique normal faults under oblique extension.Due to the long time span of Columbia Supercontinent breakup(1.8e1.6 Ga),the oblique rift in the south-central Ordos Basin is formed under the continuous oblique extension at the western margin of the North China Plate.
Meng LiXiangbin YanWei ZhangYuanling GuoChaoying LiuLingling FanShuang Yang
关键词:MESOPROTEROZOIC
Late Mesoproterozoic to Early Neoproterozoic Tectonic Evolution of the SW Yangtze Block, South China: Evidence from U-Pb Geochronology and Lu-Hf Isotopes of Detrital Zircons from Sedimentary Rocks
2024年
In situ zircon U-Pb geochronological and Lu-Hf isotope studies of detrital zircons from Late Mesoproterozoic to Early Neoproterozoic sedimentary units on the southwestern margin of the Yangtze Block have important implications for the tectonic evolution of the Yangtze Block.The Huili Group contains zircons whose ages are mainly Late Archean to Mesoproterozoic(2650-2450,2100-1800,and 1350-1150 Ma).The Dengxiangying Group has one major age population of 1900-1600 Ma,and two subordinate age populations of 1350-1100 and 2300-2000 Ma.Yanbian Group sedimentary rocks have a zircon age population mainly in the range of 970-850 Ma,contemporaneous with the ages of widespread arc-related magmatism in the western Yangtze Block.Combining these results with previous work,the Huili and Dengxiangying groups were most likely deposited during ca.1160 to 1000 Ma in an intra-continental rift basin setting,while the Yanbian Group accumulated during>920 to 782 Ma in a back-arc basin setting at the southwestern margin of the Yangtze Block.In addition,all these results further suggest a tectonic transition from a continental rift basin to a convergent environment at the southwestern margin of the Yangtze Block at 1000-970 Ma.
Peiwen LiuXiaozhong DingYanxue LiuJibiao Zhang
鄂尔多斯盆地中元古界长城系地质特征与勘探前景
2024年
中元古代长城系是鄂尔多斯盆地第一套沉积盖层,分布范围广,研究与勘探程度较低。利用野外露头、风险探井PT1井等钻井成果及三维地震等资料,开展了长城系地层对比与展布、沉积和烃源岩特征等系统分析。鄂尔多斯盆地长城系自下而上主要发育熊耳群、白草坪组、北大尖组、崔庄组和洛峪口组5段层组;在不同裂陷槽具有不同的展布特征,在晋陕裂陷槽,长城系发育熊耳群、白草坪组、北大尖组、崔庄组和洛峪口组;定边裂陷槽发育熊耳群、白草坪组和北大尖组;贺兰裂陷槽仅发育北大尖组。长城系以半深海—浅海—滨岸—三角洲沉积体系为主,期间发育潮坪沉积。熊耳裂谷及盆地次级裂陷槽的多口探井均在崔庄组发现有效的烃源岩,有机碳含量最高为1.52%,R_(o)平均为2.32%,具有规模生烃的成藏潜力;盆地热演化模拟表明,崔庄组烃源岩于二叠世中期R_(o)达到0.5%时进入成熟阶段,早白垩世晚期R_(o)达到2.0%时进入生干气阶段。综合研究认为,鄂尔多斯盆地长城系烃源岩与储层源储配置良好,可以形成自生自储的天然气藏,优选定边裂陷槽、晋陕裂陷槽两个勘探目标,为盆地深层天然气“向源”勘探提供了方向。
刘刚杨文敬杨文敬井向辉白海峰时保宏任军峰任军峰潘星魏嘉怡
关键词:鄂尔多斯盆地中元古界长城系沉积相烃源岩勘探前景
鄂尔多斯盆地北缘书记沟中元古界长城系烃源岩地质特征
2024年
是否发育有效烃源岩是鄂尔多斯盆地中元古界成藏的关键。采用野外地质考察、显微薄片鉴定和地球化学分析等研究方法,对鄂尔多斯盆地北缘书记沟中元古界长城系阿古鲁沟组烃源岩地质特征展开研究。研究表明,阿古鲁沟组烃源岩为黑色含粉砂质泥质碳质板岩及黑色含电气石云母碳质千枚岩,原岩为黑色含砂页岩。烃源岩有机碳含量高,为0.34%~9.56%,平均值为3.3%;有机质类型以Ⅰ型和Ⅱ1型为主;R_(o)变化范围为3.57%~4.68%,平均值为4.09%;T_(max)值为404~562℃,处于以生成干气为主的过成熟阶段。稀土元素配分模式为轻稀土微富集、轻重稀土分异不明显的略微右倾型;δCe值为0.74~0.92,表现出Ce负异常;δEu变化范围比较大,为0.95~4.83,指示阿古鲁沟组烃源岩当时沉积时处于还原-氧化过渡环境。稀土元素、微量元素含量指示阿古鲁沟组烃源岩形成于滨浅海-台后盆地沉积环境。当时,气候温暖潮湿,间或出现短暂偏干热气候变化,水体具有一定深度,能量较小,为与北侧广海沟通有限的较闭塞贫氧-厌氧、咸水-微咸水还原环境,这种条件非常有利于烃源岩的形成。
冯娟萍姚韦卓欧阳征健李文厚
关键词:中元古界烃源岩地质特征
云南峨山塔甸地区中元古界黑山头组石英岩矿地质特征被引量:1
2024年
通过1:5万区域地质调查、典型剖面及刻槽采样等研究,在云南峨山塔甸地区中元古界黑山头组识别出厚104~227 m数层石英岩矿层,含矿岩性为灰白色、白色、乳白色块-厚层状石英岩,呈隐晶质-粒状变晶结构,主要由石英(>95%)组成;分析显示样品SiO_(2)含量为95.15%~99.41%,Al_(2)O_(3)含量为0.21%~2.61%,CaO含量为0.008%~0.047%,TFe_(2)O_(3)含量为0.088%~0.47%,K_(2)O含量为0.009%~0.56%,MgO含量为0.010%~0.13%,Na_(2)O含量为0.012%~1.4%,TiO_(2)含量为0.011%~0.06%,部分达到玻璃用、结晶硅用等硅质原料矿工业指标要求,黑山头组石英岩矿为多层位赋存且单体厚度大的矿体,层位稳定,且延伸较远,为一套滨海相沉积-变质型石英岩矿床,具有较大潜在价值和经济效益,有望形成大型石英岩矿原料产地。
李维科刘军平晏海宝胡绍斌何世军赵江泰赵云江魏思礼
关键词:中元古界沉积变质型找矿潜力
古—中元古代哥伦比亚超大陆裂解的动力学过程及效应被引量:1
2024年
超大陆的聚合与裂解是板块构造运动的自我表达形式,其聚合过程伴随有全球性俯冲、碰撞造山活动,而裂解过程则发育大规模基性岩浆事件。哥伦比亚超大陆是地球地质历史时期第一个真正意义上的全球性超大陆,其主体于2.1~1.8Ga完成聚合,并于1.3 Ga最终裂解。相较于其他年轻的超大陆,哥伦比亚超大陆的古地理重建模型还存在较大的不确定性,这限制了对其裂解动力学过程及效应的认识。本文以全球古—中元古代基性岩浆事件对比为主线,综合已有研究成果及全球岩浆岩地球化学数据,提出古—中元古代多期地幔柱活动主导了哥伦比亚超大陆的不彻底裂解,影响了当时大陆地壳的化学成分和地形高度。高度分异的大陆地壳与低地形导致由陆壳物质风化剥蚀进入海洋的营养物质的通量大大降低,进而限制了海洋生物的初级生产力,最终阻碍了哥伦比亚超大陆至罗迪尼亚超大陆过渡时期的生命演化进程。
卢桂梅
关键词:地幔柱
华北克拉通中元古代A型花岗岩的成因及其构造意义
2024年
华北克拉通保存有与Columbia超大陆裂解相关的中元古代岩浆记录。本文综述了华北克拉通中元古代A型花岗岩的时空分布、岩石学和地球化学等特征,讨论了各期次A型花岗岩的成因及构造背景,论述了其对华北克拉通中元古代裂解事件的指示意义。华北克拉通主要发育4期A型花岗岩:1)~1.78 Ga A型花岗岩主要分布于南缘熊耳裂陷槽和晋陕地区;2)~1.70 Ga A型花岗岩主要分布于北缘渣尔泰—白云鄂博和燕辽裂陷槽;3)~1.60 Ga A型花岗岩主要分布于南缘熊耳裂陷槽;4)~1.32 Ga A型花岗岩主要分布于北缘渣尔泰—白云鄂博和燕辽裂陷槽。这4期A型花岗岩均来源于地壳物质的部分熔融,可能与同期伸展作用导致岩浆底侵提供热源有关。整体具有造山后伸展到陆内裂谷环境的演化序列,且存在明显的时空差异。华北克拉通中元古代A型花岗岩记录了4期主要的裂解事件,为华北克拉通参与了Columbia超大陆裂解提供了依据。
陈杰陈杰杨明慧贾会冲张威刘鑫白东来田刚李竞赢
关键词:A型花岗岩
Sedimentary paleoenvironment and its control on organic matter enrichment in the Mesoproterozoic hydrocarbon source rocks in the Ordos Basin,southern margin of the North China Craton
2024年
The black shale of the Mesoproterozoic Cuizhuang Formation in the Changcheng System in Yongji city,North China Craton,is a potential source rock.Understanding the organic matter enrichment mechanism is crucial for evaluating source rock resources and understanding oil and gas accumulation mechanisms.In this study,we evaluated the sedimentary paleoenvironment and organic matter enrichment mechanisms of shale using thin section observations,mineral composition analysis,organic geochemistry,and elemental geochemistry.We found significant differences in the sedimentary paleoenvironment and organic matter enrichment mechanisms between the lower Cuizhuang Formation and the Beidajian Formation shale.The Cuizhuang Formation was deposited in a late-stage,restricted basin environment during the rift phase,and elemental and geochemical indicators showed that the Cuizhuang Formation was in a suboxic-anoxic water environment,that was influenced by a warm and humid paleoclimate and submarine hydrothermal activities,which promoted the accumulation of organic matter.However,the enrichment of organic matter in the Cuizhuang Formation was mainly controlled by redox conditions.The formation of suboxic-anoxic water environments may be closely related to the warm and humid paleoclimate and submarine hydrothermal activities.Warm conditions promote continental weathering and increase marine productivity,thereby consuming oxygen in the bottom water.Moreover,acidic hydrothermal activity also helps to establish an anoxic environment.Our results reveal the effects controlling various coupled mechanisms dominated by redox conditions,which may explain the development of source rocks in the Cuizhuang Formation.
Zhi-Chen WuJu-Ye ShiTai-Liang FanMing Jiang
关键词:PALEOENVIRONMENTS
Druse Calcite Crystals Formed by Mesoproterozoic Paleo-Earthquake Activity in the Northern Margin of the North China Craton
2024年
The Meso-neoproterozoic Bayan Obo rift is located along the northern margin of the North China Craton,and was associated with the break-up of the Columbia supercontinent.During rift evolution,syn-sedimentary deformation occurred due to tectonic activity and earthquakes.Seismic events are recorded in the Jianshan Formation of the Bayan Obo Group,Inner Mongolia,as soft sediment deformation structures in the central Bayan Obo rift.Druse calcite crystals and collapse breccias in the Jianshan Formation may provide information on the rift evolution.The druse calcite crystals are idiomorphic-columnar in shape and associated with graphite,pyrite,and quartz.δ^(13)C values of the graphite are−20‰,indicative of biogenic deoxygenation and formation in water.The druse calcite crystals are inorganic in origin and formed in water at a temperature of 55℃,based on calciteδ^(13)C andδ^(18)O data.The calcite grew in paleo-caves containing fault breccias,with heat derived from faulting.As such,the druse calcite crystals are important evidence for seismic events.The collapse breccias(i.e.,fault breccias)and other indicators of slip show that displacement occurred from NE to SW,which is different from the paleocurrent direction in the Jianshan Formation.The thickness of the collapse breccia is∼200 m,which represents the height of the fault scarp.The strike of the fault scarp was NE-SW,based on the distribution of the collapse breccia.The Bayan Obo and Yanliao rifts experienced rapid NW-SE extension,and developed similar deformation structures at ca.1.6 Ga related to break-up of the Columbia supercontinent.
Yueshuang DuZhiguang ZhouGuosheng WangChen WuWenchao Xu
关键词:PROTEROZOIC
鄂尔多斯盆地中元古界蓟县系白云岩中硅质赋存特征及成因机制
2024年
鄂尔多斯盆地及周缘中元古界蓟县系白云岩中广泛发育硅质,硅质被认为是这套白云岩致密化的主要因素。但对硅质赋存特征及其矿物相态关系缺乏详细研究,进而影响了对这套硅质白云岩的硅化和致密化机理的合理解释。野外剖面观测和室内岩石学及地球化学研究表明,白云岩中赋存的硅质以层纹状/条带状、结核状/团块状和弥散状产出。层纹状/条带状硅质以大规模硅质和白云岩相互叠置发育为特征,微观光学显微镜下表现为隐/微晶石英,具有低稀土元素含量、弱Ce负异常、微弱Eu正异常、高Al_(2)O_(3)和TiO_(2)含量等特征,是由海水中SiO_(2)在大陆边缘浅水区域直接沉淀和海水中微生物诱导SiO_(2)在含氧光合生物蓝细菌周围进行沉淀形成。结核状/团块状硅质常以不规则的形式分布在基岩中,主要硅质相态为玉髓、微晶石英,其LaN/CeN值接近1,伴随着弱Ce负异常、微弱Eu负异常,是由海水中的SiO_(2)和陆源碎屑输入的SiO_(2)在晚成岩阶段充填于铸模孔、格架孔形成。弥散状硅质在宏观上不具明显组构特征,微观光学显微镜下以隐/微晶石英为主,具有较高Eu正异常的特征,是由SiO_(2)对白云石进行交代形成。蓟县系白云岩中硅化具有明显的选择性和旋回性,从而导致该套硅质白云岩致密化,致使岩石孔隙度降低,对优质储层的发育不具有建设性作用。
赵青刘波魏柳斌白海峰芦飞凡吴淳石开波
关键词:鄂尔多斯盆地中元古界硅化

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徐兆良
作品数:12被引量:35H指数:4
供职机构:中国科学院植物研究所系统与进化植物学国家重点实验室
研究主题:EARLY_CAMBRIAN YUNNAN FOSSILS NORTH_CHINA NEW