八庙-青山金红石矿床成矿年龄

METALLOGENIC AGES OF BAMIAO—QINGSHAN RUTHILE DEPOSIT

河南八庙与陕西青山金红石矿床同处于秦岭构造带、西峡-南湾地向斜褶皱束,其赋矿层位龟山组与牛耳川组层位相当,时代归属曾存在争议。近年来,对其化石研究资料将二者均划归为中泥盆统。现测试含矿岩石中角闪石的40Ar-39Ar年龄为371.3±9.3Ma,为其时代归属提供了新的佐证。综合分析认为,八庙-青山金红石矿赋矿地层为中泥盆统信阳群龟山组(牛耳川组),其变质时代为晚泥盆世,是华力西运动的产物。

Bamiao and Qingshan ruthile deposits are all located in Qin Ling tectonic belt and Xixia--Nanwandi synclinal fold virgation, occurring in Guishan group and Niuerchuan group. There was controversy about the host rocks＇ age. In recent years, according to the research date of fossil, the host rocks were belonged to Middle Devonian~ By testing, the 40Ar-39Ar age of amphibole in mineral rock is 371.3__＋ 9.3Ma, which provides new evidence for their age ownership. It is thought after comprehensive analysis that Bamiao --Qing Ling ruthile deposit mainly lies in the Guishan formation （Niuerchuan formation） of Xining group in Middle Devonian and the metamorphic age is Late Devonian, resulting from Variscan movement.