Triassic-Neogene Heavy Minerals' Assemblages Characteristics and Basin-Orogen Tectonic Evolution Relationship in the Kuqa Foreland Basin
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摘要: 通过分析库车前陆盆地多口钻井中三叠系—新近系重矿物含量、种类组合以及砂岩碎屑组分特征，建立了由重矿物特征组合与砂岩碎屑组分反映沉积物源与构造演化关系的分析方法，显示出重矿物组合特征对构造运动存在明显的响应关系，反映出库车前陆盆地三叠纪—新近纪存在中—晚三叠世、晚侏罗世—早白垩世、晚白垩世、古近纪和中新世5期明显构造运动。并且通过分析库车前陆盆地古近系库姆格列木群重矿物的颜色、含量以及特征组合与碎屑物的成分认为，库车坳陷北部山前带平面上存在三个主要的物源通道，即吐孜井区北侧、克拉井区北侧和大北井区北侧；西部温宿凸起存在一个物源通道，即却勒井区西侧的温宿凸起斜坡带上。Abstract: It established an analytical method to elucidate the relationship between sediment sources and tectonic evolution by the analyses on heavy minerals type and their assemblages and the characteristics of sandstone detrital component in Kuqa foreland basin, it shows the relationship of response to tectonic movement on the characteristics of heavy mineral assemblage. Meanwhile, it also shows that there are five periods tectogenesis during Triassic-Neogene, that are Middle-Late Triassic, Late Jurassic-Early Cretaceous, Late Cretaceous, Paleogene and Miocene. Different heavy minerals assemblages and increasing of unstable heavy minerals during Late Jurassic-Early Cretaceous, Late Cretaceous and Miocene might indicate tectonic activity during these three periods. By analyzing the color, content and their assemblages characteristics of the heavy mineral and sandstone detrital composition of the Kuqa foreland basin, there mainly existed three provenance channel that is the Tuzi-Dina, Dabei and Kela sediment sources areas in the northern piedmont zone of Kuqa depression and one that is the Quele sediment sources areas in the Wensu uplift. The Triassic-Neogene tectonic activities and evolution of the basin-orogen pattern in the Kuqa basin should be related to the heavy minerals' assemblages characteristics.
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Key words:
- Kuqa depression /
- Triassic-Neogene /
- heavy mineral /
- provenance /
- basin-orogen evolution /
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