GEOLOGICAL CHARACTERISTICS AND METALLOGENIC AGE OF BORLY PORPHYRY CU DEPOSITS IN BALKHASH METALLOGENIC BELT, KAZAKHSTAN
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摘要:
巴尔喀什成矿带是世界著名的中亚成矿域斑岩型铜钼成矿带, 产出许多大型-超大型斑岩型铜钼矿床和一些石英脉-云英岩型钨钼矿床。本文介绍了巴尔喀什成矿带博尔雷大型斑岩型铜(钼)矿床地质特征, 并对该矿床2件辉钼矿样品进行了铼-锇同位素分析, 得到博尔雷大型斑岩型铜(钼)矿床的辉钼矿模式年龄(平均值)为315.9 Ma, 说明了晚石炭世巴尔喀什成矿带斑岩型铜钼矿床的形成年龄, 属海西晚期构造-岩浆活动的产物。博尔雷斑岩铜矿成矿时代介于东天山与西准噶尔斑岩型铜矿床的成矿时代之间。
Abstract:The Balkhash Metallogenic Belt in Kazakhstan, with the output of many large and superlarge porphyry Cu-Mo deposits and some quartz-vein greisen W-Mo deposits, is a very famous porphyritic Cu-Mo metallogenic belt in Central Asian Metallogenic domain. In this paper, the geological characteristics of the Borly Porphyry Cu Deposit are briefly introduced, and 2 molybdenite samples from the deposit are selected for Re-Os isotopic dating. The molybdenites from porphyritic Borly Cu-Mo deposit give average model Re-Os ages of 315.9 Ma. The Re-Os model ages of the deposit suggest that Late Carboniferous porphyry granitoid and pegmatite magmatism during Late Hercynian movement. Comparing to the Juggar-East Tianshan porphyry Cu metallogenic belt in northwestern China, the time of the Cu-Mo metallogenesis in Balkhash metallogenic belt, is between that of Tuwu-Yandong and Baogutu porphyry Cu deposits in East Tianshan and west Junggar.
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Key words:
- Re-Os isotopic age /
- molybdenite /
- Borly Porphyry Cu deposit /
- Balkhash Metallogenic Belt /
- Kazakhstan
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表 1 哈萨克斯坦巴尔喀什成矿带博尔雷斑岩铜钼矿床辉钼矿样品Re-Os同位素分析数据
Table 1. Re-Os isotopic data for molybdenites from Borly Cu-Mo deposits in Balkhash metallogenic belt, Kazakhstan and the standard material
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