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松树沟橄榄岩是一个弱蛇纹石化的超镁铁质岩体,它侵入在区域变质的斜长角闪片岩中。业已证明,该岩体有一个出露良好且未受破坏的高温变质带。可用以下证据来鉴定松树沟接触变质围岩:从远离接触带到靠近接触带斜长石成分愈来愈基性,由An_(12)—An_(60),角闪石的颜色从蓝绿—绿—褐绿—深褐色,辉石和柘榴石只局限于接触带的内部,向着接触带榍石减少,钛磁铁矿增多,穿过接触带,角闪石的化学成分表现出(Na+K),Al和Ti的增多。
The pine gully peridotite is a weakly serpentinite ultramafic mass that intrudes into the metamorphosed plagioclase feldspathic rocks. It has been shown that the rock mass has a well-exposed and undamaged high temperature metamorphic belt. The following evidences may be used to identify the metamorphic surrounding rocks in the Songgou Gully: from the contact zone to the proximity zone, the plagioclase composition is more and more basic. The color of the amphibole from An_ (12) -An_ (60) The green-brown-green-dark brown, pyroxene and garnet are confined to the interior of the contact zone and decrease toward the contact zone, with increased amounts of titanium magnetite passing through the contact zone. The chemical composition of amphibole shows (Na + K ), An increase of Al and Ti.