Convergence history of the Jiamusi and Songnen-Zhangguangcai Range massifs: Insights from detrital zircon U-Pb geochronology of the Yilan Heilongjiang Complex, NE China
Convergence history of the Jiamusi and Songnen-Zhangguangcai Range massifs: Insights from detrital zircon U-Pb geochronology of the Yilan Heilongjiang Complex, NE China
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佳木斯和松嫩-张广才岭地块的汇聚历史：中国东北依兰黑龙江杂岩碎屑锆石 U-Pb 年代学的见解
DOI：
10.1016/j.gr.2017.12.008
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发表时间：
2018-04
影响因子：
6.1
通讯作者：
Xu Wenliang
中科院分区：
文献类型：
--
作者：
Dong Yu;Ge Wenchun;Yang Hao;Ji Zheng;He Yue;Zhao Di;Xu Wenliang
黑龙江杂岩位于佳木斯和松嫩-张广才地块之间，是近年来构造研究的热点。本文记录了宜兰-华南地区黑龙江杂岩变质沉积岩U-Pb碎屑锆石年龄的新数据。这些资料不仅对佳木斯和松嫩-张广才地块的沉积时间和物源提供了重要的约束，而且对佳木斯和松嫩-张广才地块复杂的收敛史也有了进一步的认识。黑龙江杂岩体锆石多呈“岩浆状”锆石稀土元素模式，富集重稀土元素，且Ce正、Eu负异常，岩浆成因。激光烧蚀-电感耦合等离子体质谱锆石U-Pb分析表明，这些变质沉积岩中最年轻的碎屑锆石的206pb /238U年龄一致，约为230 ~ 180 Ma。结合黑龙江杂岩的中侏罗统变质时代，我们认为宜兰黑龙江杂岩的变质沉积岩形成于晚三叠世—早侏罗世。约55%的碎屑锆石生成年龄为297 ~ 180 Ma，峰值为270 ~ 245 Ma、230 ~ 200 Ma和200 ~ 180 Ma； 27%的碎屑锆石生成年龄为544 ~ 412 Ma，峰值为500 ~ 480 Ma。元古代碎屑锆石（~ 15%）年龄在2352 ~ 595 Ma之间，以新元古代的锆石居多。结合野外关系和已有年龄，认为宜兰杂岩碎屑锆石主要来源于佳木斯和松嫩—张广才地块的火成岩。宜兰—黑龙江杂岩的变质沉积岩原岩极有可能在佳木斯—松农—张广才地块会聚的弧前盆地背景下沉积。
The Heilongjiang Complex, located between the Jiamusi and Songnen-Zhangguangcai Range massifs, has become a focus of tectonic research in recent years. Here we document new U-Pb detrital zircon age data for metasedimentary rocks from the Heilongjiang Complex in Yilan-Huanan counties. These data not only provide important constraints on the depositional timing and provenance, but also give further insights into the complicated convergence history of the Jiamusi and Songnen-Zhangguangcai Range massifs. Most zircons from the Heilongjiang Complex show “magmatic-like” zircon rare earth element patterns, with enrichment in heavy rare earth elements and positive Ce and negative Eu anomalies, suggesting a magmatic origin. Laser ablation-inductively coupled plasma-mass spectrometry zircon U-Pb analysis indicates that the youngest detrital zircons in these metasedimentary rocks have concordant206Pb/238U ages of ca. 230–180 Ma. Based on this finding and the Middle Jurassic metamorphic ages of the Heilongjiang Complex, we conclude that metasedimentary rocks of the Yilan Heilongjiang Complex were deposited during the Late Triassic-Early Jurassic. Approximately 55% of the detrital zircons yield ages of 297 to 180 Ma, with peaks at 270–245 Ma, 230–200 Ma and 200–180 Ma, while 27% of the detrital zircons yield ages of 544–412 Ma with a peak at 500–480 Ma. Proterozoic detrital zircons (~ 15%) were also identified, yielding ages of 2352 to 595 Ma, with most being of Neoproterozoic age. These results, combined with field relationships and previously published ages, suggest that detrital zircons in the Yilan Heilongjiang Complex were sourced mainly from igneous rocks in the Jiamusi and Songnen-Zhangguangcai Range massifs. Moreover, the protoliths of the metasedimentary rocks in the Yilan Heilongjiang Complex were most likely deposited in a forearc basin setting during convergence between the Jiamusi and Songnen-Zhangguangcai Range massifs.
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