کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8912678 | 1639570 | 2018 | 81 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Geochronological and petrogenetic constraints on the regional tectonic evolution of the Guanghua Group in northeastern Jiao-Liao-Ji Belt, China
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Geochronological and petrogenetic constraints on the regional tectonic evolution of the Guanghua Group in northeastern Jiao-Liao-Ji Belt, China Geochronological and petrogenetic constraints on the regional tectonic evolution of the Guanghua Group in northeastern Jiao-Liao-Ji Belt, China](/preview/png/8912678.png)
چکیده انگلیسی
A sequence of Paleoproterozoic meta-supracrustal rocks, known as the “Guanghua Group”, is exposed to the north of Tonghua City, Jilin Province, China. The composition and ages of formation and metamorphism of the protolith, and the tectonic petrogenesis of the Guanghua Group are poorly understood. Comprehending these rocks are important in constraining the formation and evolutionary history of the northern segment of the Paleoproterozoic Jiao-Liao-Ji Belt. We have studied the petrology and geochemistry of these meta-supracrustal rocks, revealing that the protoliths can be sub-divided into two groups: metavolcanic and metasedimentary rocks. The metavolcanic rocks are mainly amphibolite, biotite-bearing plagiogneiss, and minor biotite leptynites, whose protoliths were basaltic andesite, andesite, and minor rhyolite with both calc-alkaline and tholeiite affinities. Petrogenetic studies indicate that the intermediate-basic rocks were derived from a depleted lithospheric mantle wedge that was metasomatized by slab-derived fluids or melts. The metasedimentary rocks consist of biotite-quartz schist and staurolite-bearing garnet-muscovite schist, together with minor biotite-bearing plagiogneiss and biotite leptynites, with protoliths mainly comprising mudstone with subordinate sandstone and greywacke. The structure, composition, and U-Pb ages of zircon indicate that the protoliths of the metavolcanic and metasedimentary rocks formed at ca. 2.18Â Ga and 2.03Â Ga, respectively, and were modified by two stages of metamorphism at ca. 1.90 and 1.85Â Ga. The protoliths of the metasedimentary rocks were derived mainly from mid-Paleoproterozoic granites, with minor contributions from coeval metabasic rocks and Archean granitic rocks. Based on these findings and existing regional data, we suggest that: (i) the Paleoproterozoic supracrustal rocks of the Guanghua Group are comparable with the Laoling Group in their age of formation, composition, and petrogenesis, and were the products of the same geological event; meaning that rocks of the Guanghua Group should be considered as part of the Laoling Group; (ii) the metabasic and metasedimentary rocks formed in a back-arc basin setting; and (iii) the pre-mid-Paleoproterozoic formation and evolution of the northern segment of the Jiao-Liao-Ji Belt were related to arc-continent collision.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Precambrian Research - Volume 305, February 2018, Pages 427-443
Journal: Precambrian Research - Volume 305, February 2018, Pages 427-443
نویسندگان
Chao-Yang Wang, En Meng, Hong Yang, Chao-Hui Liu, Jia Cai, Lei Ji, Yan-Guang Li,