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| 济阳盆地南缘古近系碎屑高压变质矿物的发现及其构造古地理含义 | |
| 引用本文： | 李忠,许承武,石永红,李阳.济阳盆地南缘古近系碎屑高压变质矿物的发现及其构造古地理含义[J].岩石学报,2009,25(12):3130-3140. |
| 作者姓名： | 李忠 许承武 石永红 李阳 |
| 作者单位： | 1. 中国科学院地质与地球物理研究所,北京,100029 2. 合肥工业大学,合肥,230009 3. 中国石化股份有限公司油田部,北京,100728 |
| 基金项目： | 国家自然科学基金项目 |
| 摘 要： | 针对华北济阳盆地南缘、鲁西隆起北麓的博兴洼陷新生代沉积,通过矿物分离、显微鉴定、探针分析与计算,发现古近系孔店组和沙河街组第四段中存在确凿的碎屑蓝闪石、冻蓝闪石、多硅白云母等高压矿物.结合同层位碎屑重矿物组合与区域碰撞造山带物源的对比分析,说明上述高压矿物源于胶东地区的苏鲁造山带,而其源岩是否与俯冲洋壳的折返有关值得进一步研究.对碎屑蓝闪石等高压矿物物源进一步的讨论说明,它们极可能直接来源于苏鲁造山带,但不排除博兴洼陷同时期也接受了来自鲁西地区的剥露物质(含再旋回物源).因此,鲁西隆起-苏鲁造山带晚中生代-古近纪早期具有明显的东高西低的古地理特点,而自古近纪始新世中期45Ma左右(相当于沙河街组四段顶界年龄)古地势开始逆转.换句话说,45Ma以后鲁西隆起基本阻隔了直接来自苏鲁造山带的物源. |
| 关 键 词： | 高压变质矿物 碎屑物源 蓝闪石 苏鲁造山带 济阳盆地博兴洼陷 鲁西隆起 |
| 收稿时间： | 2008/10/12 0:00:00 |
| 修稿时间： | 8/9/2009 12:00:00 AM |
Discovery of detrital high-pressure metamorphic minerals from Paleocene-Eocene strata in Jiyang basin, eastern North China, and its implication for tectonic-paleogeographic setting |
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| LI Zhong,XU ChengWu,SHI YongHong and LI Yang.Discovery of detrital high-pressure metamorphic minerals from Paleocene-Eocene strata in Jiyang basin, eastern North China, and its implication for tectonic-paleogeographic setting[J].Acta Petrologica Sinica,2009,25(12):3130-3140. | |
| Authors: | LI Zhong XU ChengWu SHI YongHong and LI Yang |
| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Hefei University of Industry, Hefei 230009, China;Department of Oil Field, SINOPEC, Beijing 100728, China |
| Abstract: | Through detrital heavy mineral separation, microscopic identification and probe measure and compositional data analysis, some detrital high-pressure metamorphic minerals, including glaucophane, barroisite and phengite, were found from the Kongdian Formation and the No.4 segment of Shahejie Formation, Paleogene, in the Boxing Sag located in the south margin of Jiyang basin near the north foot of Luxi Uplift. Provenance correlation analysis, with depositional records of detrital heavy mineral assemblages and petrologic tectonic attributes of regional collisional orogenic belts, shows that the detrital high-pressure minerals sourced from the Sulu orogenic belt, in which high-pressure metamorphic rocks probably resulted from return of deep subducted oceanic crust (more research proofs needed). Further discussion on provenances of detrital high-pressure minerals in the Boxing Sag most probably directly sourced from the Sulu orogenic belt during the Early Paleogene. At the same time, exhumation materials (including recycled deposits) of the Luxi Uplift probably become partial provenances of the Boxing Sag. Therefore, evident topography in west high to east low once occurred over the Luxi Uplift-Sulu orogenic belt during Late Mesozoic-Early Paleogene, and, however, gradually reversed since 45Ma (corresponding to age of top layer of the No.4 segment of Shahejie Formation). In other words, the Luxi Uplift basically obstruct provenances directly derived from the Sulu orogenic belt since 45Ma. |
| Keywords: | High-pressure metamorphic minerals Detrital provenance Glaucophane Sulu orogenic belt Jiyang basin Luxi Uplift |
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