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江苏北部新沂、东海、赣榆一带,经历年地质调查,发现了数以百计的蛇纹岩体,其成因多年来一直被认为是超基性侵入体,笔者近几年,有机会进行了短时间的野外考察,并对较著名的许沟岩体采集了系统样品。经野外观察,结合岩石薄片鉴定,发现橄榄岩体顶部和一套次闪石岩密切共生,再往上,盖有次闪石化斜长角闪岩及石英钠长浅粒岩,这是一个具有密切成因联系的岩套。在蛇纹岩体顶部的次闪石岩中,发现了比较清楚的鬣刺结构,因而确认它是火山喷发相的超镁铁质岩石一科马提岩。它的上部有较完整的细碧一角斑岩(可能
After years of geological investigations, hundreds of serpentinite bodies have been discovered in Xinyi, East China Sea and Ganyu areas of northern Jiangsu. Their origins have been considered as ultrabasic intrusions for many years. In recent years, the author has had the opportunity to conduct A short field investigation, and the more famous Xugou rock system collected samples. After field observation and rock identification, it was found that the top of Peridotite is closely interbedded with a set of Pleistocene, and then uplifted with the amphibolite-amphibolite and quartz-bearing prunella, Closely related to the rock formation. In the serpentinite at the top of the serpentinite body, a clearer hyenarchaeous structure was found, thus confirming that it is a volcanic eruption of the ultra-mafic rock-komatiite. Its upper part has a more complete small corner of a bit of porphyry (probably