高压—超高压岩石对合肥盆地侏罗系沉积的贡献
Contribution of high-pres sure and ultrahigh-pressure rocks to the Jurassic sedimentation in Hefei basin
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摘要: 合肥盆地侏罗系沉积包括防虎山组、三尖铺组、周公山组和凤凰台组。上述地层中砂岩普遍产出碎屑白云母，而且几乎都为多硅白云母，Si原子数多从3．3至3．6（p.f.u），表明大别造山带高压－超高压变质岩石是合肥盆地沉积的重要物源。由於防虎山组地层沉积於早侏罗世，该地层中碎屑多硅白云母的新发现表明大别造山带高压－超高压岩石在早侏罗世时期已经出露地表。Abstract: The Jurassic sedimentary strata of Hefei Basin include the formations of Fanghus han, Sanjianpu, Zhougongshan and Fenghuangtai. Detrital white mica ubiquitously occurs in sandstones of these formations. The white mica is almost phengitic and the majority of the phengites has high Si content from 3.3 to 3.6(p.f.u.), whic h indicates that the high-pressure and ultrahigh-pressure rocks were an import ant s ource for the Jurassic sediments of Hefei Basin. The Fanghushan Formation d eposited during the early Jurassic. Therefore, the new discovery of detrital phe ngites in the Fanghushan Formation indicates that the high-pressure and ultrahi gh-pressure rocks of the Dabie orogenic belt were already exposed to the surfac e in the early Jurassic time.
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Key words:
- Phengite /
- High pressure and ultrahigh pressure rocks /
- Source rock /
- Jurassic /
- Hef ei basin /
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