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Detrital Zircon U‐Pb Geochronology and Provenance of the Hebukesaier Formation in the Shaerbuerti Mountains, Northern West Junggar: Implication for Devonian Subduction of the Junggar–Balkhash Ocean
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2019-07-22 , DOI: 10.1111/1755-6724.14327 Hao LIANG 1 , Jiafu CHEN 1, 2 , Bo LIU 1 , Hongzhang YANG , Mingyang XIN 1
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2019-07-22 , DOI: 10.1111/1755-6724.14327 Hao LIANG 1 , Jiafu CHEN 1, 2 , Bo LIU 1 , Hongzhang YANG , Mingyang XIN 1
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Limited Devonian magmatic record in northern West Junggar leads to contrasting models on its tectonic evolution. In this study, we conducted LA‐ICP‐MS U‐Pb dating on detrital zircons of two sandstones from the Hebukesaier Formation in the Shaerbuerti Mountains. Detrital zircons with oscillatory zoning are characterized by high Th/U (> 0.3) and low La/Yb (< 0.15), indicating their magmatic origin. The youngest zircon ages of two samples are 402 ± 2 Ma and 406 ± 2 Ma, respectively, suggesting that the Hebukesaier Formation was deposited at the Early Devonian. Detrital zircon age patterns show single peaks (at ca. 424 Ma, n = 157), which indicates that these clastics were likely proximal accumulation after short distance transportation. Provenance of the Hebukesaier Formation was the Xiemisitai and Shaerbuerti Mountains. Detrital zircon ages range from 481 Ma to 395 Ma, which indicates that there was relatively continuous Early Paleozoic magmatism in the Xiemisitai and Shaerbuerti Mountains since the Early Ordovician. Age spectrums of sampled detrital zircons are distinct from those of Lower Devonian strata either in southern West Junggar or in East Junggar, which implies for individual tectonic evolution of northern West Junggar. We favor that Lower Devonian Hebukesaier Formation was developed in a fore–arc setting due to the northward subduction of the Junggar–Balkhash Ocean.
中文翻译：
准Jung尔北部西部沙尔伯蒂山脉的碎屑锆石U-Pb年代学和Hebukesaier组物源：对准gar尔-巴尔喀什海洋泥盆系俯冲的启示
西准gar尔北部的泥盆纪岩浆记录有限，导致其构造演化形成对比模型。在这项研究中，我们对Shaerbuerti山脉Hebukesaier组的两块砂岩的碎屑锆石进行了LA‐ICP‐MS U-Pb测年。具有振荡带状的碎屑锆石的特征是高Th / U（> 0.3）和低La / Yb（<0.15），表明它们的岩浆成因。两个样品的最小锆石年龄分别为402±2 Ma和406±2 Ma，这表明Hebukesaier组沉积于泥盆纪早期。碎屑锆石年龄模式显示出一个单峰（约424 Ma，n= 157），这表明这些碎屑可能是短距离运输后的近端堆积。Hebukesaier组的起源是下米斯台山和沙伯尔蒂山。碎屑锆石的年龄范围为481 Ma至395 Ma，这表明自奥陶纪以来，下米斯太台和沙伯尔提山的早古生代岩浆作用相对连续。样品碎屑锆石的年龄谱与西准de尔南部或东准gar尔的下泥盆纪地层不同，这暗示着西准gar尔北部的个体构造演化。我们认为，由于准gar尔-巴尔喀什海洋的北向俯冲作用，下泥盆统赫布克赛尔组是在前弧环境中发育的。
更新日期：2019-07-22
中文翻译：
准Jung尔北部西部沙尔伯蒂山脉的碎屑锆石U-Pb年代学和Hebukesaier组物源：对准gar尔-巴尔喀什海洋泥盆系俯冲的启示
西准gar尔北部的泥盆纪岩浆记录有限，导致其构造演化形成对比模型。在这项研究中，我们对Shaerbuerti山脉Hebukesaier组的两块砂岩的碎屑锆石进行了LA‐ICP‐MS U-Pb测年。具有振荡带状的碎屑锆石的特征是高Th / U（> 0.3）和低La / Yb（<0.15），表明它们的岩浆成因。两个样品的最小锆石年龄分别为402±2 Ma和406±2 Ma，这表明Hebukesaier组沉积于泥盆纪早期。碎屑锆石年龄模式显示出一个单峰（约424 Ma，n= 157），这表明这些碎屑可能是短距离运输后的近端堆积。Hebukesaier组的起源是下米斯台山和沙伯尔蒂山。碎屑锆石的年龄范围为481 Ma至395 Ma，这表明自奥陶纪以来，下米斯太台和沙伯尔提山的早古生代岩浆作用相对连续。样品碎屑锆石的年龄谱与西准de尔南部或东准gar尔的下泥盆纪地层不同，这暗示着西准gar尔北部的个体构造演化。我们认为，由于准gar尔-巴尔喀什海洋的北向俯冲作用，下泥盆统赫布克赛尔组是在前弧环境中发育的。
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