Abstract
Whole-rock geochemistry and zircon trace element, U–Pb and Hf isotopic data for Upper Permian volcanic ash at Shangsi show a significant change in source from the Emeishan Large Igneous Province (LIP) to a convergent plate margin magmatic arc. The lower stratigraphic samples display high Al 2 O 3 /TiO 2 ratios, strong negative Eu anomalies, and no depletion in high field strength elements. Zircons with ages of ca. 260 Ma from these ashes have a geochemical affinity to within-plate-type magmas and with felsic ignimbrites from the uppermost part of the Emeishan volcanic succession at Binchuan. These features, combined with relatively high ε Hf (t) values and low Th/Nb ratios in the zircons, imply a late-stage felsic volcanic origin related to Emeishan LIP. The upper stratigraphic samples at Shangsi display significant depletion in Nb and Ti; zircons separated from these volcanic ashes are chemically similar to those from arc-related/orogenic rocks, indicative of a magmatic arc source. Combined with published high-precision CA-TIMS data for these volcanic ash layers, the Emeishan volcanism can be constrained to between ca. 260–257.8 Ma. The age of Emeishan volcanism is consistent with the Wuchiapingian climate cooling event, supporting a potential linkage between these two phenomena.
| Original language | English |
|---|---|
| Pages (from-to) | 293-306 |
| Number of pages | 14 |
| Journal | Lithos |
| Volume | 314-315 |
| DOIs | |
| Publication status | Published - 1 Aug 2018 |
Keywords
- Climate cooling
- Emeishan large igneous province
- Felsic volcanism
- Geochemistry
- Volcanic ashes
Cite this
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Provenance of Late Permian volcanic ash beds in South China : Implications for the age of Emeishan volcanism and its linkage to climate cooling. / Huang, Hu; Cawood, Peter A.; Hou, Ming Cai; Ni, Shi Jun; Yang, Jiang Hai; Du, Yuan Sheng; Wen, Hua Guo.
In: Lithos, Vol. 314-315, 01.08.2018, p. 293-306.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Provenance of Late Permian volcanic ash beds in South China
T2 - Implications for the age of Emeishan volcanism and its linkage to climate cooling
AU - Huang, Hu
AU - Cawood, Peter A.
AU - Hou, Ming Cai
AU - Ni, Shi Jun
AU - Yang, Jiang Hai
AU - Du, Yuan Sheng
AU - Wen, Hua Guo
PY - 2018/8/1
Y1 - 2018/8/1
N2 - Whole-rock geochemistry and zircon trace element, U–Pb and Hf isotopic data for Upper Permian volcanic ash at Shangsi show a significant change in source from the Emeishan Large Igneous Province (LIP) to a convergent plate margin magmatic arc. The lower stratigraphic samples display high Al 2 O 3 /TiO 2 ratios, strong negative Eu anomalies, and no depletion in high field strength elements. Zircons with ages of ca. 260 Ma from these ashes have a geochemical affinity to within-plate-type magmas and with felsic ignimbrites from the uppermost part of the Emeishan volcanic succession at Binchuan. These features, combined with relatively high ε Hf (t) values and low Th/Nb ratios in the zircons, imply a late-stage felsic volcanic origin related to Emeishan LIP. The upper stratigraphic samples at Shangsi display significant depletion in Nb and Ti; zircons separated from these volcanic ashes are chemically similar to those from arc-related/orogenic rocks, indicative of a magmatic arc source. Combined with published high-precision CA-TIMS data for these volcanic ash layers, the Emeishan volcanism can be constrained to between ca. 260–257.8 Ma. The age of Emeishan volcanism is consistent with the Wuchiapingian climate cooling event, supporting a potential linkage between these two phenomena.
AB - Whole-rock geochemistry and zircon trace element, U–Pb and Hf isotopic data for Upper Permian volcanic ash at Shangsi show a significant change in source from the Emeishan Large Igneous Province (LIP) to a convergent plate margin magmatic arc. The lower stratigraphic samples display high Al 2 O 3 /TiO 2 ratios, strong negative Eu anomalies, and no depletion in high field strength elements. Zircons with ages of ca. 260 Ma from these ashes have a geochemical affinity to within-plate-type magmas and with felsic ignimbrites from the uppermost part of the Emeishan volcanic succession at Binchuan. These features, combined with relatively high ε Hf (t) values and low Th/Nb ratios in the zircons, imply a late-stage felsic volcanic origin related to Emeishan LIP. The upper stratigraphic samples at Shangsi display significant depletion in Nb and Ti; zircons separated from these volcanic ashes are chemically similar to those from arc-related/orogenic rocks, indicative of a magmatic arc source. Combined with published high-precision CA-TIMS data for these volcanic ash layers, the Emeishan volcanism can be constrained to between ca. 260–257.8 Ma. The age of Emeishan volcanism is consistent with the Wuchiapingian climate cooling event, supporting a potential linkage between these two phenomena.
KW - Climate cooling
KW - Emeishan large igneous province
KW - Felsic volcanism
KW - Geochemistry
KW - Volcanic ashes
UR - http://www.scopus.com/inward/record.url?scp=85048742338&partnerID=8YFLogxK
U2 - 10.1016/j.lithos.2018.06.009
DO - 10.1016/j.lithos.2018.06.009
M3 - Article
VL - 314-315
SP - 293
EP - 306
JO - Lithos
JF - Lithos
SN - 0024-4937
ER -