Match!

The Emeishan large igneous province: A synthesis

Published on May 1, 2014in Geoscience frontiers4.16
· DOI :10.1016/j.gsf.2013.07.003
J. Gregory Shellnutt18
Estimated H-index: 18
(NTNU: National Taiwan Normal University)
Abstract
Abstract The late Permian Emeishan large igneous province (ELIP) covers ∼0.3 × 10 6  km 2 of the western margin of the Yangtze Block and Tibetan Plateau with displaced, correlative units in northern Vietnam (Song Da zone). The ELIP is of particular interest because it contains numerous world-class base metal deposits and is contemporaneous with the late Capitanian (∼260 Ma) mass extinction. The flood basalts are the signature feature of the ELIP but there are also ultramafic and silicic volcanic rocks and layered mafic-ultramafic and silicic plutonic rocks exposed. The ELIP is divided into three nearly concentric zones (i.e. inner, middle and outer) which correspond to progressively thicker crust from the inner to the outer zone. The eruptive age of the ELIP is constrained by geological, paleomagnetic and geochronological evidence to an interval of ≤3 Ma. The presence of picritic rocks and thick piles of flood basalts testifies to high temperature thermal regime however there is uncertainty as to whether these magmas were derived from the subcontinental lithospheric mantle or sub-lithospheric mantle (i.e. asthenosphere or mantle plume) sources or both. The range of Sr ( I Sr  ≈ 0.7040–0.7132), Nd (ɛ Nd ( t ) ≈ −14 to +8), Pb ( 206 Pb/ 204 Pb 1  ≈ 17.9–20.6) and Os (γ Os  ≈ −5 to +11) isotope values of the ultramafic and mafic rocks does not permit a conclusive answer to ultimate source origin of the primitive rocks but it is clear that some rocks were affected by crustal contamination and the presence of near-depleted isotope compositions suggests that there is a sub-lithospheric mantle component in the system. The silicic rocks are derived by basaltic magmas/rocks through fractional crystallization or partial melting, crustal melting or by interactions between mafic and crustal melts. The formation of the Fe-Ti-V oxide-ore deposits is probably due to a combination of fractional crystallization of Ti-rich basalt and fluxing of CO 2 -rich fluids whereas the Ni-Cu-(PGE) deposits are related to crystallization and crustal contamination of mafic or ultramafic magmas with subsequent segregation of a sulphide-rich portion. The ELIP is considered to be a mantle plume-derived LIP however the primary evidence for such a model is less convincing (e.g. uplift and geochemistry) and is far more complicated than previously suggested but is likely to be derived from a relatively short-lived, plume-like upwelling of mantle-derived magmas. The emplacement of the ELIP may have adversely affected the short-term environmental conditions and contributed to the decline in biota during the late Capitanian.
Figures & Tables
  • References (228)
  • Citations (109)
References228
Newest
#1Mei-Fu Zhou (HKU: University of Hong Kong)H-Index: 71
#2Wei Terry Chen (HKU: University of Hong Kong)H-Index: 18
Last.Geoffrey H. Howarth (Rhodes University)H-Index: 14
view all 6 authors...
#1Clément Ganino (University of Nice Sophia Antipolis)H-Index: 6
#2Nicholas T. Arndt (CNRS: Centre national de la recherche scientifique)H-Index: 67
Last.Charlotte Athurion (CNRS: Centre national de la recherche scientifique)H-Index: 1
view all 5 authors...
#1Clément Ganino (University of Nice Sophia Antipolis)H-Index: 6
#2Chris Harris (UCT: University of Cape Town)H-Index: 43
Last.Geoffrey H. Howarth (Rhodes University)H-Index: 14
view all 5 authors...
#1Sun-Lin Chung (NTU: National Taiwan University)H-Index: 66
#2Bor-ming Jahn (University of Rennes)H-Index: 81
Last.CONGBolin (CAS: Chinese Academy of Sciences)H-Index: 7
view all 5 authors...
Cited By109
Newest
#1Zeyang Liu (Northwest University (United States))
#2David Selby (China University of Geosciences)H-Index: 36
Last.Benoit Beauchamp (U of C: University of Calgary)H-Index: 28
view all 8 authors...
#1Zezhong Zhang (Northwest University (United States))H-Index: 1
#2Jiangfeng Qin (Northwest University (United States))H-Index: 13
Last.Fangyi Zhang (Northwest University (United States))H-Index: 1
view all 8 authors...
#1Wenkun Qie (CAS: Chinese Academy of Sciences)H-Index: 7
#2Thomas J. Algeo (UC: University of Cincinnati)H-Index: 31
Last.Achim D. Herrmann (LSU: Louisiana State University)H-Index: 13
view all 4 authors...
#1Xiaoli Shen (SDUST: Shandong University of Science and Technology)H-Index: 4
#2Baolin Zhang (CAS: Chinese Academy of Sciences)H-Index: 8
Last.Yanping Su (CAS: Chinese Academy of Sciences)H-Index: 2
view all 4 authors...
#1Yong Huang (China University of Geosciences)
#2Chuan He (China University of Geosciences)H-Index: 3
Last.Bin Xia (China University of Geosciences)H-Index: 7
view all 4 authors...
#1Jun-Hua Yao (CAS: Chinese Academy of Sciences)H-Index: 1
#2Wei-Guang Zhu (CAS: Chinese Academy of Sciences)H-Index: 15
Last.Zhong-Jie Bai (CAS: Chinese Academy of Sciences)H-Index: 10
view all 7 authors...
View next paperPetrologic and geochemical constraints on the petrogenesis of Permian-Triassic Emeishan flood basalts in southwestern China