论文部分内容阅读
位于斋桑地洼区萨吾尔山北坡的布氏金矿是＂七五＂期间新发现的一个矿床。本文通过对区内典型火山岩、侵入岩体的岩石地球化学特征及锶、钕同位素的研究，确定它们形成于晚古生代，火山岩的喷发年龄为３４７Ｍａ，侵入岩的定位年龄为３１０～３２９Ｍａ；同位素特征参数＝０．７０３７～０．７０４６，都比较小，值为＋６．６７～－５．５６，近于零，值为＋５．６５～＋７．９６，大于零，说明它们具有相似的物质来源，是地幔岩浆或其衍生物熔融导生的；斋桑地洼区的基底为晚元古代甚至更老，地壳的增生可能是遵循非均一的生长模式。
The Brigde Gold Mine, located on the northern slope of the Sa’u’er Mountains in the Zaisangdi depression area, was a newly discovered deposit during the “Seventh Five-Year Plan” period. Based on the study on the geochemical characteristics of the typical volcanic rocks and intrusive rocks in the area and the study on the strontium and neodymium isotopes, the eruption ages of these volcanic rocks were 347Ma and 310 ~ 329Ma. The isotopic characteristics Parameter = 0.7037 ~ 0.7046, are relatively small, the value of + 6.67 ~ -5.56, close to zero, the value of +5.65 ~ +7.96, greater than zero, indicating that they have a similar material source, Is derived from mantle magma or its derivatives. The basement of the Zaisandandan area is Late Neoproterozoic or even older, and the crustal proliferation may follow a non-uniform growth pattern.