| 论胶东半岛西北部胶东群地层、金的矿源层和金矿床的层控性质(续) |
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| 引用本文： | 杨士望.论胶东半岛西北部胶东群地层、金的矿源层和金矿床的层控性质(续)[J].地质找矿论丛,1986(3):39-49. |
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| 作者姓名： | 杨士望 |
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| 作者单位： | 冶金部山东地质勘探公司第三地质勘探队 |
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| 摘 要： | 四、胶东群的地质时代,各岩组时序及基底构造问题沈阳地矿所余汉茂1983年在栖霞桃村至十八盘一带,采选了胶东群化山组地层中锆石试样5个,送北京铀矿地质研究所作铀—钍—铅同位素年龄测定,其结果见表3。表3之锆石年龄为一致年龄。作Pb—Pb等时线,得年龄值为2662.5±21.9 22.3百万年(见图16)。作阿仑斯—韦瑟里尔(两阶段)一致曲线模式图(见图17),得上交点年龄2675±17.2 9.6百万年,数据点集中在上段,铅略有丢失,但不影响Pb-Pb等时线。两者年龄在误差范围内一致,下交点误差大,无地质意义。故胶东群化山组的成岩年龄为2675±17.2 9.6百万年。
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A DISCUSSION ON THE JIAODONG GROUP STRATA, THE SOURCE-BED OF GOLD AND THE STRATABOUND FEATURES OF GOLD ORE DEPOSITS IN NORTHWEST PART OF JIAODONG PENINSULA |
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| Yang Shiwang.A DISCUSSION ON THE JIAODONG GROUP STRATA, THE SOURCE-BED OF GOLD AND THE STRATABOUND FEATURES OF GOLD ORE DEPOSITS IN NORTHWEST PART OF JIAODONG PENINSULA[J].Contributions to Geology and Mineral Resources Research,1986(3):39-49. |
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| Authors: | Yang Shiwang |
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| Abstract: | Abundant gold ores in the northwest part of Jiaodong Peninsula occur in "crust-derived" granites of the Jiaodong Group strata of the late Archean, which is formed by metasomatism.Through the study on the metamorphic formation, original rock-formation, gold-bearing abundance and isotope chronology of the Jiaodong Group strata, the auther has made the first try to determine the succession and time limit of the metamorphic strata, and got the recognition that the Jiaodong Group strata should be divided into five formations, the previous argument about "the existance of Qixia anticlinorium structure" thus denied.Ac cording to the Precambrian strata, the gold-bearing abundance of.the "crust-derived" granite, the distribution regularity of the gold ore deposits and the characteristics of the stable isotope of S, Pb, O, e source-bed of gold is determined, the stratabound features for gold ore deposits also demonstrated. |
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