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DOI | 10.1130/B35059.1 |
New insights into the Precambrian tectonic evolution and continental affinity of the Qilian block: Evidence from geochronology and geochemistry of metasupracrustal rocks in the North Wulan terrane | |
Wang, Lu1,2; Johnston, Stephen T.2; Chen, Nengsong1 | |
2019-09-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2019 |
卷号 | 131页码:1723-1743 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Canada |
英文摘要 | The Qilian block, one of the Precambrian terranes in the Qinling-Qilian-Kunlun orogenic system, is a critical region for reconstruction of the overall architecture and tectonic evolution of NW China. This investigation of zircon U-Pb and Lu-Hf isotopes and whole-rock geochemistry of a metasupracrustal sequence in the North Wulan terrane provides new insights into the Qilian block. A Statherian-Calymmian unit (ca. 1.67-1.5 Ga), dominated by Al- and Si-rich gneisses, arkosites, quartzites, and amphibolites with minor calc-silicate rocks and marbles, is interpreted to have been deposited during continental rifting. Detrital zircons show two main age populations of 2685-2276 and 2098-1761 Ma with mostly negative epsilon(Hf)(t) values (-14.0 to +3.6). The sources are characterized by mixed felsic to intermediate igneous rocks as well as recycled components and are interpreted as being derived from the Tarim craton because of the age distribution of their detrital zircons. A Stenian-Tonian unit (ca. 1.1-0.9 Ga) consists mainly of felsic gneisses, quartzites, calc-silicate rocks, marbles, metavolcanic rocks, and amphibolites. The metasedimentary rocks yielded detrital zircon ages clustering at ca. 1.64, 1.43, 1.3-1.2, 1.1, and 0.94 Ga with predominantly positive epsilon(Hf)(t) values (-7.1 to +9.7). One metavolcanic rock has an age of ca. 1110 Ma and epsilon(Hf)(t) values of +6.5 to +9.1. The provenance is dominated by local syndepositional arc-related igneous rocks with older detritus possibly from Laurentia, again based on the age distribution of the detrital zircons. The Central Qilian and Hualong terranes show strong affinities with the North Wulan terrane and together constituted a single coherent Qilian block prior to their involvement in the Qilian-North Qaidam orogen. The Qilian block was probably once part of the Tarim craton and had a strong linkage to South Tarim, which drifted from North Tarim during the breakup of Columbia in the early Mesoproterozoic. We suggest that, from the late Mesoproterozoic to early Neoproterozoic, the South Tarim-Qilian formed an active continental margin located close to Laurentia during the assembly of Rodinia. The final collision occurred in the early Neoproterozoic with the formation of a significant continent that included the reunified Tarim-Qilian as well as Qaidam-Kunlun and Qinling terranes, Alxa block, Kyrgyz-Chinese Tianshan, and Yili block. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000483604100016 |
WOS关键词 | ZIRCON U-PB ; PALEOPROTEROZOIC CRUSTAL EVOLUTION ; LA-ICP-MS ; MESOPROTEROZOIC DONGCHUAN GROUP ; NORTHEASTERN TARIM CRATON ; SOUTH CHINA IMPLICATIONS ; GA MAFIC MAGMATISM ; WESTERN ALXA BLOCK ; HF ISOTOPIC DATA ; LIAO-JI BELT |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186689 |
专题 | 地球科学 |
作者单位 | 1.China Univ Geosci, Sch Earth Sci, Lumo Rd 388, Wuhan 430074, Hubei, Peoples R China; 2.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada |
推荐引用方式 GB/T 7714 | Wang, Lu,Johnston, Stephen T.,Chen, Nengsong. New insights into the Precambrian tectonic evolution and continental affinity of the Qilian block: Evidence from geochronology and geochemistry of metasupracrustal rocks in the North Wulan terrane[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131:1723-1743. |
APA | Wang, Lu,Johnston, Stephen T.,&Chen, Nengsong.(2019).New insights into the Precambrian tectonic evolution and continental affinity of the Qilian block: Evidence from geochronology and geochemistry of metasupracrustal rocks in the North Wulan terrane.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131,1723-1743. |
MLA | Wang, Lu,et al."New insights into the Precambrian tectonic evolution and continental affinity of the Qilian block: Evidence from geochronology and geochemistry of metasupracrustal rocks in the North Wulan terrane".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131(2019):1723-1743. |
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