| 准噶尔盆地南缘侏罗系碎屑成分特征及其对构造属性、盆山格局的指示意义 |
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| 引用本文： | 方世虎,郭召杰,吴朝东,张志诚,王美娜,袁庆东.准噶尔盆地南缘侏罗系碎屑成分特征及其对构造属性、盆山格局的指示意义[J].地质学报,2006,80(2):196-209. |
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| 作者姓名： | 方世虎 郭召杰 吴朝东 张志诚 王美娜 袁庆东 |
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| 作者单位： | 1. 北京大学地球与空间科学学院,100871;中国石油勘探开发研究院,北京,100083
2. 北京大学地球与空间科学学院,100871 |
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| 基金项目： | 国家重点基础研究发展规划项目(编号2001CB409804)资助的成果。 |
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| 摘 要： | 砂岩碎屑成分分析是进行沉积物源岩石类型、构造属性和盆山演化分析的重要途径。准噶尔盆地南缘侏罗系物源构造属性以“再旋回造山带”、“弧造山带”和部分“岩浆弧”物源为特征,物源岩石类型主要为中酸性岩浆岩、变质岩和沉积岩,岩石成分、重矿物含量及其组合显示东、西剖面在物源上存在一定差异。天山内部侏罗系物源构造属性以“再旋回造山带”、“混合造山带”为主,物源岩石类型主要为中酸性岩浆岩和变质岩,但各剖面的岩石成分、重矿物组合特征及相对含量差异较大。综合天山内部与准噶尔盆地南缘野外剖面沉积特征、岩屑成分及钻井岩心分析表明,天山地区早、中侏罗世盆山格局以盆地沉积范围大、天山正地形较小为特征,不存在地理分割明显的天山山脉,侏罗纪盆地南缘至少存在三个物源体系(西准噶尔山、克拉麦里山和(古)天山)；晚侏罗世一早白垩世早期,岩石成分成熟度偏低,砾岩等粗碎屑沉积明显增多,同时不稳定重矿物及其组合稍有增加可能与晚侏罗世天山构造格局分异、构造活动相对活跃有关,天山山脉明显隆升并造就天山南北沉积环境的巨大差异。
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| 关 键 词： | 岩屑组分 盆山格局 侏罗系 准噶尔盆地南缘 天山 |
| 修稿时间： | 2005年3月31日 |
Jurassic Clastic Composition in the Southern Junggar Basin, Northwest China: Implications for Basin-Range Pattern and Tectonic Attributes |
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| FANG Shihu,GUO Zhaojie,WU Chaodong,ZHANG Zhicheng,WANG Mein,YUAN Qingdong School of Earth and Space Sciences,Peking University,Beijing, Research Institute of Petroleum Exploration and Development,Beijing.Jurassic Clastic Composition in the Southern Junggar Basin, Northwest China: Implications for Basin-Range Pattern and Tectonic Attributes[J].Acta Geologica Sinica,2006,80(2):196-209. |
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| Authors: | FANG Shihu GUO Zhaojie WU Chaodong ZHANG Zhicheng WANG Mein YUAN Qingdong School of Earth and Space Sciences Peking University Beijing Research Institute of Petroleum Exploration and Development Beijing |
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| Abstract: | It is important method to understand provenance types, basin-range evlution and tectonic attributes through detrital composition of sandstones. The sandstone framework grains and detrital heavy minerals of Jurassic in Tianshan and southern Junggar basin generally show low detrital maturity, which mainly resulted from tectonic activities and orogenesis the provenance area-the (ancestral) Tianshan. To the Jurassic of three field sections in Tianshan Mountains, the ancestral Tianshan supplied provenance mainly consisting of metamorphic rocks and acidic volcanic rocks and characterized by recycled orogen and mixed orogenic sandstones types, but the characteristics of detrital composition show different provenances of the three sections. The Jurassic of southern Junggar basin consist of provenances of metamorphic, acidic volcanic and sedimentary rocks attributed to recycled orogen, magmatic-arc and arc orogenic sandstones types. The detrital compositions suggesting some differences in provenance between the western and eastern section of southern Junggar basin, but the characteristics of Houxia and Toutunhe section show that they have similar sandstones types and tectonic attributes. The integrated research on clastic deposition of Jurassic filed sections and well cores shows that the main sediment sources of Jurassic southern Junggar basin include the Kelamaili, west Junggar Mountain and (ancestral) Tianshan. The Junggar Basin and Tarim Basin were not physiographically separated throughout the Early-Middle Jurassic by an ancestral version of the Tianshan Mountains. From the Late Jurassic to the terminal Jurassic, the changes in sedimentary facies, unstable heavy minerals and sandstone composition show tectonically active setting and obvious uplift of Tianshan during the Late Jurassic to the early age of early Cretaceous, led to the widely different sedimentary succession of Tarim Basin and southern Junggar Basin. |
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| Keywords: | southern Junggar Basin Tianshan Mountains detrital composition basin-range pattern Jurassic |
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