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首页> 外文期刊>American Journal of Science >SHRIMP U-Pb AND CAMECA 1280 OXYGEN ISOTOPE RESULTS FROM ANCIENT DETRITAL ZIRCONS IN THE CAOZHUANG QUARTZITE, EASTERN HEBEI, NORTH CHINA CRATON: EVIDENCE FOR CRUSTAL REWORKING 3.8 Ga AGO
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SHRIMP U-Pb AND CAMECA 1280 OXYGEN ISOTOPE RESULTS FROM ANCIENT DETRITAL ZIRCONS IN THE CAOZHUANG QUARTZITE, EASTERN HEBEI, NORTH CHINA CRATON: EVIDENCE FOR CRUSTAL REWORKING 3.8 Ga AGO

机译：华北克拉通草丛石英岩中古代碎屑锆石的SHRIMP U-Pb和CAMECA 1280氧同位素结果：3.8 Ga AGO地壳重现的证据

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摘要

The Caozhuang quartzite, located in Eastern Hebei Province in the eastern part of the North China Craton, has long been known to contain the oldest detrital zircon population in China. A suite of 30 zircons with preliminary ages > 3.7 Ga were selected for detailed SHRIMP U-Pb and CAMECA 1280 oxygen isotope analyses. SHRIMP U-Pb dating reveals that ages range from 3860 to 3135 Ma, the former being the oldest ~(207)Pb/~(206)Pb zircon age so far obtained from the North China Craton. Values of delta~(18)O range from 5.4 to 7.5 permil, similar to Archean igneous zircons worldwide, but the average value for the 30 zircons is 6.6 permil, which is approx 0.3 permil higher than suite averages for detrital zircons from the Jack Hills and Beartooth Mountains and nearly 1 permil higher than magmatic zircons from igneous rocks of the Superior Province and Barberton. These elevated values of delta~(18)O suggest reworking of a significant amount of juvenile crust, older than 3.8 Ga, that underwent a low temperature supracrustal history and was distributed throughout the source region in northeast China.
机译：曹庄石英岩位于华北克拉通东部的河北省东部，长期以来已知其含有中国最古老的碎屑锆石。选择了30个初步年龄大于3.7 Ga的锆石进行详细的SHRIMP U-Pb和CAMECA 1280氧同位素分析。 SHRIMP U-Pb测年表明年龄范围为3860至3135 Ma，前者是迄今为止从华北克拉通获得的最古老的〜（207）Pb /〜（206）Pb锆石年龄。 δ〜（18）O的值在5.4至7.5 permil的范围内，与全世界的太古代火成锆石相似，但30个锆石的平均值为6.6 permil，比Jack Hills碎屑锆石的套房平均值高0.3 permil。和比尔图斯山（Beartooth Mountains），比上级省和巴伯顿的火成岩中的岩浆锆石高出近1个百分点。这些升高的δ〜（18）O值表明，经过低温上壳化历史并在中国东北整个源区分布的年龄大于3.8 Ga的幼鱼壳的返工。

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