Relationship Between Conglomeratic Characteristics and Tectonic Evolution of Upper Jurassic-Lower Cretaceous in Kuqa Foreland Basin
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摘要: 库车前陆盆地充填有上侏罗统喀拉扎组砾岩、下白垩统底部亚格列木组砾岩和下白垩统上部巴什基奇克组砾岩，通过对这三套砾岩区域分布特征、岩石学特征、砾态特征、厚度变化特征的详细描述与此三套砾岩沉积古环境的差异对比研究，认为库车前陆盆地中部库车河地区及西部卡普沙良河地区这三套砾岩成份复杂多样，具低成份与结构成熟度；所代表的气候演化特征由早到晚依次为：干旱、半干旱→温暖、湿润→干旱、炎热气候；所反映的沉积相为冲积扇、浊积扇和季节性辫状河沉积。砾岩与构造关系的结果分析表明，喀拉扎组砾岩是晚侏罗世构造活动的标志，亚格列木组砾岩为早白垩世初逆冲推覆活动的开始，巴什基奇克组砾岩则是早白垩世末构造宁静期的沉积响应产物。
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关键词:
- 库车前陆盆地 /
- 上侏罗统&mdash /
- 下白垩统 /
- 砾岩特征 /
- 构造演化
Abstract: Kuqa foreland basin is filled with three sets of conglomerate, which are Kalazha conglomerate at the top of Upper Jurassic, Yageliemu conglomerate at the bottom of Lower Cretaceous and Bashijiqike Formation at the top of Lower Cretaceous. Through the detailed description of regional distribution, petrological features, sephitic features, variation in thickness and comparison difference in depositional paleoenvironment between the three sets of conglomerate, conclude that these conglomerates have complex composition, low-compositional maturity and low-textual maturity. The characteristics of climate evolution which these conglomerates represent from early to late are arid, semi-arid →warm, moist→arid, hot. It reflects that these conglomerates are composed of three main sedimentary facies: alluvial fan, turbidite fan and seasonal braided river deposit. The relationship between conglomerate and tectonic activity indicates that the Kalazha conglomerate is the sign of tectonic activity during Late Jurassic. Yageliemu conglomerate is the result of over thrusting activities during the beginning of Early Cretaceous. And the conglomerate in Bashijiqike Formation is a sedimentary response to structural stillstand during the end of Early Cretaceous. -
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