Petrology and Provenance Analysis of Hanjiagou Conglomerates in the Northern Margin of West Qinling
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摘要: 对西秦岭北缘出露的上新世韩家沟砾岩进行了野外观测，在此基础上进行了沉积特征研究及物源分析。结果表明，韩家沟砾岩以细砾为主，成分主要是砂岩和灰岩，其次为花岗岩和石英岩；砾石磨圆较差，是岩性、水动力条件、搬运距离等因素共同作用的结果；垂向上，洪积砾岩与冲积砾岩交替出现，粒径呈现反旋回，揭示了扇体的进积发育；砾石扁平面指示由南向北的古水流方向。物源为30～50 km外南部及西南部山区，砂岩砾石主要来自岷县东侧泥盆系大草滩群，灰岩砾石主要来自二叠系大关山组；花岗岩-花岗闪长岩砾石可能来自漳县以南教场坝-碌础坝花岗闪长岩-二长花岗岩侵入序列；砾岩为上新世青藏高原持续北东向扩展的产物，是干旱气候条件下，由南向北的河流搬运形成一套近-中源间歇性河流冲积及洪积为主的冲积扇沉积体系，属扇根中部沉积。Abstract: On the basis of field observations of the Pliocene conglomerates of Hanjiagou in the northern margin of west Qinling, this paper carried out the research on the sedimentary characteristics and provenance.The results show that Hanjiagou conglomerate is mainly composed offine gravel.The components are mainly sandstone and limestone, others aregranite and quartzite.The poor roundness of gravels is the result of the combined action of lithology, hydrodynamic conditions and transportation distance.The proluvial conglomerates and alluvial conglomerates occured alternately.The grain size presents a reverse cycle, which reveals the progradational development of the fan. The flat surface indicates a south-to-north direction of paleocurrent.The provenance is 30-50km away in the south and southwest of the mountain areas. The sandstone gravels mainly come from Dacaotan group of Devonian System, east of Minxian county.Limestone gravels are mainly from the Permian Daguanshan formation.Granitegranodiorite gravels may come from Jiaochangba-Luchuba granodiorite monzogranite in south Zhangxian.The conglomerates is the product of the continuous northeastern extension of Pliocene Tibetan Plateau, transported by rivers from south to north in dry climate and deposited in the middle of the root of alluvial fan.
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