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DOI	10.18654/1000-0569/2022.03.08
	Genesis and tectonic magmatic evolution of Carboniferous granites in the Hongliuhecao-Yuejinshan area of Beishan orogenic belt
	Bai RongLong; Hu JinRong; Zhao FuFeng; Yue YaHui; Zhou HuiLing
通讯作者	Bai, RL (通讯作者)
发表日期	2022
ISSN	1000-0569
EISSN	2095-8927
起始页码	713
结束页码	742
卷号	38 期号:3
英文摘要	Beishan orogenic belt is located in the southern margin of the Central Asian Orogenic Belt. Magmatic records of paleo-Asian ocean-continent evolution widely existed in this area, and as a result, it is an important window to study the tectonic magmatic mineralization and dynamic background of Beishan orogenic belt. Hongliuhecao-Yuejinshan area is an important component of the middle-northern part of Beishan orogenic belt, however, the formation age, genesis and tectonic background of granites related to mineralization in the area are not clear, which seriously restricts the discussion of diagenetic and metallogenic dynamic backgrounds in Beishan orogenic belt. Based on systematic and detailed field geological survey and petrographic (facies) observation, combined with the evidence of magmatic rock geochemistry, zircon U-Pb chronology and Lu-Hf isotope, we analyzes the formation age, type, source area and dynamic background of granite in Hongliuhecao-Yuejinshan area in Beishan orogenic belt, from which the following conclusions can be obtained: (1) According to zircon LA-ICP-MS U-Pb dating, the formation ages of Langwashan monzogranite, Hongliuhecao syenogranite, Yuejinshanbei syenogranite and Yuejinshan monzogranite related to mineralization are 327. 1 +/- 2. 4Ma, 326.7 +/- 2. 4Ma, 321. 3 +/- 2. 4Ma and 309.7 +/- 2. 2Ma, indicating that the mineralization of copper, tungsten, molybdenum, lead, zinc and other elements is related to the Carboniferous magmatism of 327. 1 similar to 309. 7Ma. (2) The geochemical study of granites shows that the granites in Hongliuhecao-Yuejinshan area are strongly enriched in LREE and LILE, while deficient in HREE and HSFE, which demonstrated that they have the geochemical characteristics of typical arc magma and the I-type granites, and belong to calc alkaline, high-K calc alkaline, quasi aluminous-weak peraluminous series. (3) The epsilon(Hf) (t) values of Langwashan monzogranite and Hongliuhecao syenogranite are 5. 90 similar to 9. 92 (average 7. 93) and 5. 87 similar to 10. 28 (average 8. 11), respectively; and the t(DM)(2) values are 0. 703 similar to 0. 959Ga and 0. 93 similar to 1. 03Ga, respectively; furthermore, they have a low Nb/Ta ratio (5. 1 similar to 14. 2, average 8. 5), which is similar to the typical magma from the newborn lower crust (8. 3). All these charateristics indicate that the magma material may have originated from the partial melting of the newborn lower crust rocks. (4) According to the zircon Ti thermometer, the average crystallization temperatures of Langwashan monzogranite, Hongliuhecao syenogranite, Yuejinshanbei syenogranite and Yuejinshan monzogranite in the studying area are 765 degrees C, 765 degrees C, 816. 4 degrees C and 771. 5 degrees C, respectively; while the zircon Ce-(IV)/Ce-(III) average values are 85. 27, 108. 4, 103. 6, 135. 7, respectively, indicating that the oxygen fugacity of magma increased gradually from the early to the late Carboniferous. Based on the above analyses, together with previous research results, the tectonic magmatic evolution model of Beishan orogenic belt is preliminarily established : the Hongshishan ocean in the north of the Beishan orogenic belt subducted under the Gongpoquan-Mingshui-Hanshan composite tectonic unit (arc) in Carboniferous, which induced partial melting of the newborn lower crust and formed the magma; this crustal magam intruded into the shallow crust, and finally formed the Hongliuhecao-Yuejinshan granite.
关键词	ARCHEAN CRUSTAL EVOLUTION A-TYPE GRANITES LU-HF U-PB ZIRCON DISCRIMINATION SYSTEMATICS
英文关键词	Beishan orogenic belt; Hongliuhecao-Yuejinshan area; Geochemistry; Granite genesis; Tectonic magmatic evolution
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000780616600008
来源期刊	ACTA PETROLOGICA SINICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260704
推荐引用方式 GB/T 7714	Bai RongLong,Hu JinRong,Zhao FuFeng,et al. Genesis and tectonic magmatic evolution of Carboniferous granites in the Hongliuhecao-Yuejinshan area of Beishan orogenic belt[J]. 中国科学院青藏高原研究所,2022,38(3).
APA	Bai RongLong,Hu JinRong,Zhao FuFeng,Yue YaHui,&Zhou HuiLing.(2022).Genesis and tectonic magmatic evolution of Carboniferous granites in the Hongliuhecao-Yuejinshan area of Beishan orogenic belt.ACTA PETROLOGICA SINICA,38(3).
MLA	Bai RongLong,et al."Genesis and tectonic magmatic evolution of Carboniferous granites in the Hongliuhecao-Yuejinshan area of Beishan orogenic belt".ACTA PETROLOGICA SINICA 38.3(2022).