From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia
The transition from breakup of Nuna (or Columbia, 2.0-1.6 Ga) to assembly of Rodinia (1.0-0.9 Ga) is investigated by means of U-Pb and Lu-Hf data of detrital zircons from three Neoproterozoic metasedimentary rocks in the Central Tianshan Block (CTB), NW China. These data yield six age peaks around 1...
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ftchacadscgigcas:oai:ir.gig.ac.cn:344008/48731 2023-05-15T16:11:39+02:00 From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia Huang, Zongying Yuan, Chao Long, Xiaoping Zhang, Yunying Du, Long 2019-12-01 http://ir.gig.ac.cn/handle/344008/48731 https://doi.org/10.1029/2018TC005471 英语 eng AMER GEOPHYSICAL UNION TECTONICS http://ir.gig.ac.cn/handle/344008/48731 doi:10.1029/2018TC005471 Geochemistry & Geophysics ZIRCON U-PB NEOPROTEROZOIC GRANITIC GNEISSES HF ISOTOPIC COMPOSITIONS PRECAMBRIAN CONTINENTAL-CRUST A-TYPE GRANITES DETRITAL-ZIRCON NW CHINA LU-HF YILI BLOCK INTRAPLATE MAGMATISM 期刊论文 2019 ftchacadscgigcas https://doi.org/10.1029/2018TC005471 2020-12-22T07:22:26Z The transition from breakup of Nuna (or Columbia, 2.0-1.6 Ga) to assembly of Rodinia (1.0-0.9 Ga) is investigated by means of U-Pb and Lu-Hf data of detrital zircons from three Neoproterozoic metasedimentary rocks in the Central Tianshan Block (CTB), NW China. These data yield six age peaks around 1.0, 1.13, 1.34, 1.4-1.6, 1.75, and 2.6 Ga. Few zircons are detected between 2.0 and 2.5 Ga. The Paleoproterozoic to Neoproterozoic detrital zircons have Hf isotopic compositions (-22.1 to +13.0) similar to those of coeval magmatic rocks in the CTB, indicating a proximal provenance. These results, together with the geological evidence and the presence of 1.4 Ga orogenic granitoids in the CTB, rule out most cratons as the CTB sources but support a Fennoscandia ancestry. Zircon U-Pb ages and Hf isotopic compositions from the CTB and Fennoscandia suggest that from 1.8 to 1.4 Ga, the epsilon(Hf)(t) values increased toward more positive values, consistent with an exterior orogen characteristic that the lower crust was replaced by a juvenile arc crust. In contrast, from 1.4 to 0.9 Ga, zircon epsilon(Hf)(t) values decreased to more negative values, reflecting an interior orogen, characterized by enhanced contribution of recycled crustal material from collided continental fragments. This marked shift most likely reflected a transition from breakup of Nuna to assembly of Rodinia, accomplished by a transformation from an exterior orogen to an interior one. Report Fennoscandia Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) Tectonics 38 12 4378 4398 |
institution |
Open Polar |
collection |
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchacadscgigcas |
language |
English |
topic |
Geochemistry & Geophysics ZIRCON U-PB NEOPROTEROZOIC GRANITIC GNEISSES HF ISOTOPIC COMPOSITIONS PRECAMBRIAN CONTINENTAL-CRUST A-TYPE GRANITES DETRITAL-ZIRCON NW CHINA LU-HF YILI BLOCK INTRAPLATE MAGMATISM |
spellingShingle |
Geochemistry & Geophysics ZIRCON U-PB NEOPROTEROZOIC GRANITIC GNEISSES HF ISOTOPIC COMPOSITIONS PRECAMBRIAN CONTINENTAL-CRUST A-TYPE GRANITES DETRITAL-ZIRCON NW CHINA LU-HF YILI BLOCK INTRAPLATE MAGMATISM Huang, Zongying Yuan, Chao Long, Xiaoping Zhang, Yunying Du, Long From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia |
topic_facet |
Geochemistry & Geophysics ZIRCON U-PB NEOPROTEROZOIC GRANITIC GNEISSES HF ISOTOPIC COMPOSITIONS PRECAMBRIAN CONTINENTAL-CRUST A-TYPE GRANITES DETRITAL-ZIRCON NW CHINA LU-HF YILI BLOCK INTRAPLATE MAGMATISM |
description |
The transition from breakup of Nuna (or Columbia, 2.0-1.6 Ga) to assembly of Rodinia (1.0-0.9 Ga) is investigated by means of U-Pb and Lu-Hf data of detrital zircons from three Neoproterozoic metasedimentary rocks in the Central Tianshan Block (CTB), NW China. These data yield six age peaks around 1.0, 1.13, 1.34, 1.4-1.6, 1.75, and 2.6 Ga. Few zircons are detected between 2.0 and 2.5 Ga. The Paleoproterozoic to Neoproterozoic detrital zircons have Hf isotopic compositions (-22.1 to +13.0) similar to those of coeval magmatic rocks in the CTB, indicating a proximal provenance. These results, together with the geological evidence and the presence of 1.4 Ga orogenic granitoids in the CTB, rule out most cratons as the CTB sources but support a Fennoscandia ancestry. Zircon U-Pb ages and Hf isotopic compositions from the CTB and Fennoscandia suggest that from 1.8 to 1.4 Ga, the epsilon(Hf)(t) values increased toward more positive values, consistent with an exterior orogen characteristic that the lower crust was replaced by a juvenile arc crust. In contrast, from 1.4 to 0.9 Ga, zircon epsilon(Hf)(t) values decreased to more negative values, reflecting an interior orogen, characterized by enhanced contribution of recycled crustal material from collided continental fragments. This marked shift most likely reflected a transition from breakup of Nuna to assembly of Rodinia, accomplished by a transformation from an exterior orogen to an interior one. |
format |
Report |
author |
Huang, Zongying Yuan, Chao Long, Xiaoping Zhang, Yunying Du, Long |
author_facet |
Huang, Zongying Yuan, Chao Long, Xiaoping Zhang, Yunying Du, Long |
author_sort |
Huang, Zongying |
title |
From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia |
title_short |
From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia |
title_full |
From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia |
title_fullStr |
From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia |
title_full_unstemmed |
From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia |
title_sort |
from breakup of nuna to assembly of rodinia: a link between the chinese central tianshan block and fennoscandia |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2019 |
url |
http://ir.gig.ac.cn/handle/344008/48731 https://doi.org/10.1029/2018TC005471 |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_relation |
TECTONICS http://ir.gig.ac.cn/handle/344008/48731 doi:10.1029/2018TC005471 |
op_doi |
https://doi.org/10.1029/2018TC005471 |
container_title |
Tectonics |
container_volume |
38 |
container_issue |
12 |
container_start_page |
4378 |
op_container_end_page |
4398 |
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1765996817409900544 |