Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31528.1 |
Neoproterozoic backarc basin on the southeastern margin of the Yangtze block during Rodinia assembly: New evidence from provenance of detrital zircons and geochemistry of mafic rocks | |
Zhang, Feng-Feng1; Wang, Xiao-Lei1; Wang, Di1; Yu, Jin-Hai1; Zhou, Xiao-Hua2; Sun, Zi-Ming1 | |
2017-07-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Several tectonic models have been proposed for the Neoproterozoic amalgamation of the South China block during the assembly of Rodinia. However, the timing of the end of arc magmatism between the two subblocks in the South China block (i.e., the Yangtze and Cathaysia blocks) remains controversial because it is unclear whether the 860-820 Ma magmatic rocks and coeval sedimentary basins in this area are related to subduction or plume activity. Here, we present new detrital zircon U-Pb and Hf isotopic data for the sediments directly overlying early Neoproterozoic arc volcanic rocks in this region. These data reveal a rhythmic change in source coincident with a progressive increase in the amount of juvenile and old crustal detritus within these sediments. This result, combined with the presence of a fining-upward grain-size trend and horizontal bedding within these sediments, provides evidence of bidirectional sources that are consistent with a backarc setting. The juvenile crustal material within these sediments was sourced from adjacent arc terranes to the east, whereas the old crustal detritus was derived from the Yangtze block to the west. In addition, sensitive high-resolution ion microprobe zircon U-Pb dating of mafic rocks within equivalent sedimentary sequences yielded ages of ca. 860-840 Ma, and these mafic rocks have arc-or mid-ocean-ridge basalt-like geochemical features that indicate the initiation of backarc spreading associated with Neoproterozoic NW-directed subduction. The data from the sediments and mafic rocks suggest the presence of a backarc basin system at ca. 860-820 Ma within the eastern margin of the Yangtze block. This in turn indicates that Rodinia assembly was not completed until ca. 820 Ma, with the South China block possibly acting as a connection between a Neoproterozoic Andean-type active continental margin and Grenvillian belts on the paleo-western margin of the Rodinia supercontinent. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405373200009 |
WOS关键词 | SHRIMP U-PB ; JIANGNAN OROGENIC BELT ; SOUTH CHINA ; TECTONIC EVOLUTION ; VOLCANIC-ROCKS ; HF ISOTOPES ; LU-HF ; CRUSTAL EVOLUTION ; ICP-MS ; MASS-SPECTROMETRY |
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/24647 |
专题 | 地球科学 |
作者单位 | 1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210046, Jiangsu, Peoples R China; 2.Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Peoples R China |
推荐引用方式 GB/T 7714 | Zhang, Feng-Feng,Wang, Xiao-Lei,Wang, Di,et al. Neoproterozoic backarc basin on the southeastern margin of the Yangtze block during Rodinia assembly: New evidence from provenance of detrital zircons and geochemistry of mafic rocks[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Zhang, Feng-Feng,Wang, Xiao-Lei,Wang, Di,Yu, Jin-Hai,Zhou, Xiao-Hua,&Sun, Zi-Ming.(2017).Neoproterozoic backarc basin on the southeastern margin of the Yangtze block during Rodinia assembly: New evidence from provenance of detrital zircons and geochemistry of mafic rocks.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Zhang, Feng-Feng,et al."Neoproterozoic backarc basin on the southeastern margin of the Yangtze block during Rodinia assembly: New evidence from provenance of detrital zircons and geochemistry of mafic rocks".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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