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
The Jurassic sedimentary strata of Hefei Basin include the formations of Fanghushan, 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 1 6 (P. f. u.), which indicates that the high-pressure and ultrahigh-pressure rocks were an important source for the Jurassic sediments of Hefei Basin. The Fanghushan Formation deposited during the early Jurassic. Therefore, the new discovery of detrital phengites in the Fanghushan Formation indicates that the high-pressure and ultrahigh-pressure rocks of the Dabie orogenic belt were already exposed to the surface in the early Jurassic time.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第4期526-530,共5页
Acta Petrologica Sinica
基金
国家重点基础研究发展规划 ( G1 9990 7550 7)
中科院重大基础研究项目 ( K951 - A1 - 40 1 - 0 7)资助
