孔雀河斜坡东南部中上奥陶统物源研究新认识
The New Understanding Obtained from the Study of the Sediment Source in Southeastern of the Kongque River Slopes in the Middle-Late Ordovician
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摘要: 通过对塔里木盆地孔雀河斜坡东南部地区中晚奥陶系砂岩中重矿物分析研究,表明库鲁克塔格露头样品稳定重矿物为锆石-电气石-石榴石-磁铁矿-赤褐铁矿组合,孔雀1井样品稳定重矿物为锆石-石榴石-电气石-白钛石组合,二者有些差异,但分析结果反映了同样的母岩性质.研究区内沉积岩母岩主要来自于酸性、中基性岩浆岩和部分变质岩,为混源产物.结合对地震剖面的分析,认为研究区物源来自南(阿尔金造山带)和北(库鲁克塔格隆起)两部.根据稳定重矿物ZTR指数判断,南、北两个方向而来的沉积物在孔雀1井附近交汇,并沿各自路线运移、沉积.Abstract: The analysis and research of heavymineral of the sandstone in southeastern of the Kongque River slopes of the Tarim basin in the Middle-Late Ordovician show that the stable heavy mineral composition of Kuruktag Outcrop samples is Zircon-Tourmaline-Garnet-Magnetite-Cheklimonite. The stable heavymineral composition of the well Kongque 1 is Zircon-Garnet-Tourmaline-Leucoxene. There are some differences between the two compositions, but the analytical results reflect the same characteristics of source rocks. The source rocks in the study area aremainly fromacid, in termediate-basicigneous rocks and some metamorphic rocks. They are mixed products. Through the analysis of the Seismic profiles, this paper hold the opinionthat the sediment source of the study a reacomes from the south (Altun Orogen) and the north (Kuruktag uplift). According to the "ZRT" index of the stable heavymineral, the sediments proved coming from south and northmetin area around the well Kongque 1, then migrated and deposited along theirownway.
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Key words:
- Kongque River slopes /
- Middle-Late Ordovician /
- heavy mineral /
- seismic profiles /
- sediment source
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