Cretaceous volcanic-intrusive magmatism in western Guangdong and its geological significance

Hongyan GENG, Xisheng XU*, S. Y. O'REILLY, Ming ZHAO, Tao SUN

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)Researchpeer-review

28 Citations (Scopus)

Abstract

Systematic zircon LA-ICPMS U-Pb dating reveals that Cretaceous volcanic-intrusive activities developed in western Guangdong. Representative volcanic rocks, i.e. Maanshan and Zhougongding rhyodacites, have zircon U-Pb isotopic ages of 100±1 Ma, and the intrusive ones including the Deqing monzonitic granite body and the Xinghua granodiorite body in the Shidong complex, as well as the Tiaocun granodiorite body in the Guangping complex yield ages of 99±2 Ma, ca. 100 Ma, and 104±3 Ma respectively. The biotite-granites of the Shidong complex main body (461±35 Ma) and that of the Guangping complex (444±6 Ma) are Caledonian. In spite of the big time interval between Cretaceous volcanic-intrusive magmatisms and Caledonian intrusive ones, both of them are characterized by enrichment in Rb, Th, Ce, Zr, Hf, Sm, depletion in Ba, Nb, Ta, P, Ti, Eu, and weakly REE tetrad effect. Eu negative anomalies are: Cretaceous volcanic rocks (Eu/Eu*=0.74), Cretaceous intrusive rocks (Eu/ Eu*=0.35-0.58), Caledonian biotite granites (Eu/ Eu*=0.31-0.34). Studies of Sr-Nd isotope data show that all these igneous rocks have high initial 87Sr/86Sr ratios (0.7105-0.7518), and low εNd(t) values (-7.23 - -11.39) with their Nd two-stage model ages ranging from 1.6-2.0 Ga, which suggest that they all derived from the Proterozoic crustal basement of southeast China. The occurrence of Cretaceous volcanic-intrusive magmatisms in western Guangdong is related with the important lithospheric extension event in southeast China (including Nanling region) at ca. 100 Ma. The "volcanic line" defined by the large scale Mesozoic intermediate-acidic volcanic magmatisms in southeast China may further extend to the southwest margin of Nanling region.

Original languageEnglish
Pages (from-to)696-713
Number of pages18
JournalScience in China, Series D: Earth Sciences
Volume49
Issue number7
DOIs
Publication statusPublished - Jul 2006
Externally publishedYes

Fingerprint

magmatism
Cretaceous
Caledonian orogeny
granodiorite
biotite
volcanic rock
zircon
igneous rock
Proterozoic
rare earth element
granite
isotope
anomaly
rock

Keywords

  • Cretaceous
  • Sr-Nd isotope
  • Volcanic-intrusive rocks
  • Western Guangdong
  • Zircon U-Pb dating

Cite this

GENG, Hongyan ; XU, Xisheng ; O'REILLY, S. Y. ; ZHAO, Ming ; SUN, Tao. / Cretaceous volcanic-intrusive magmatism in western Guangdong and its geological significance. In: Science in China, Series D: Earth Sciences. 2006 ; Vol. 49, No. 7. pp. 696-713.
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Cretaceous volcanic-intrusive magmatism in western Guangdong and its geological significance. / GENG, Hongyan; XU, Xisheng; O'REILLY, S. Y.; ZHAO, Ming; SUN, Tao.

In: Science in China, Series D: Earth Sciences, Vol. 49, No. 7, 07.2006, p. 696-713.

Research output: Journal PublicationsJournal Article (refereed)Researchpeer-review

TY - JOUR

T1 - Cretaceous volcanic-intrusive magmatism in western Guangdong and its geological significance

AU - GENG, Hongyan

AU - XU, Xisheng

AU - O'REILLY, S. Y.

AU - ZHAO, Ming

AU - SUN, Tao

PY - 2006/7

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N2 - Systematic zircon LA-ICPMS U-Pb dating reveals that Cretaceous volcanic-intrusive activities developed in western Guangdong. Representative volcanic rocks, i.e. Maanshan and Zhougongding rhyodacites, have zircon U-Pb isotopic ages of 100±1 Ma, and the intrusive ones including the Deqing monzonitic granite body and the Xinghua granodiorite body in the Shidong complex, as well as the Tiaocun granodiorite body in the Guangping complex yield ages of 99±2 Ma, ca. 100 Ma, and 104±3 Ma respectively. The biotite-granites of the Shidong complex main body (461±35 Ma) and that of the Guangping complex (444±6 Ma) are Caledonian. In spite of the big time interval between Cretaceous volcanic-intrusive magmatisms and Caledonian intrusive ones, both of them are characterized by enrichment in Rb, Th, Ce, Zr, Hf, Sm, depletion in Ba, Nb, Ta, P, Ti, Eu, and weakly REE tetrad effect. Eu negative anomalies are: Cretaceous volcanic rocks (Eu/Eu*=0.74), Cretaceous intrusive rocks (Eu/ Eu*=0.35-0.58), Caledonian biotite granites (Eu/ Eu*=0.31-0.34). Studies of Sr-Nd isotope data show that all these igneous rocks have high initial 87Sr/86Sr ratios (0.7105-0.7518), and low εNd(t) values (-7.23 - -11.39) with their Nd two-stage model ages ranging from 1.6-2.0 Ga, which suggest that they all derived from the Proterozoic crustal basement of southeast China. The occurrence of Cretaceous volcanic-intrusive magmatisms in western Guangdong is related with the important lithospheric extension event in southeast China (including Nanling region) at ca. 100 Ma. The "volcanic line" defined by the large scale Mesozoic intermediate-acidic volcanic magmatisms in southeast China may further extend to the southwest margin of Nanling region.

AB - Systematic zircon LA-ICPMS U-Pb dating reveals that Cretaceous volcanic-intrusive activities developed in western Guangdong. Representative volcanic rocks, i.e. Maanshan and Zhougongding rhyodacites, have zircon U-Pb isotopic ages of 100±1 Ma, and the intrusive ones including the Deqing monzonitic granite body and the Xinghua granodiorite body in the Shidong complex, as well as the Tiaocun granodiorite body in the Guangping complex yield ages of 99±2 Ma, ca. 100 Ma, and 104±3 Ma respectively. The biotite-granites of the Shidong complex main body (461±35 Ma) and that of the Guangping complex (444±6 Ma) are Caledonian. In spite of the big time interval between Cretaceous volcanic-intrusive magmatisms and Caledonian intrusive ones, both of them are characterized by enrichment in Rb, Th, Ce, Zr, Hf, Sm, depletion in Ba, Nb, Ta, P, Ti, Eu, and weakly REE tetrad effect. Eu negative anomalies are: Cretaceous volcanic rocks (Eu/Eu*=0.74), Cretaceous intrusive rocks (Eu/ Eu*=0.35-0.58), Caledonian biotite granites (Eu/ Eu*=0.31-0.34). Studies of Sr-Nd isotope data show that all these igneous rocks have high initial 87Sr/86Sr ratios (0.7105-0.7518), and low εNd(t) values (-7.23 - -11.39) with their Nd two-stage model ages ranging from 1.6-2.0 Ga, which suggest that they all derived from the Proterozoic crustal basement of southeast China. The occurrence of Cretaceous volcanic-intrusive magmatisms in western Guangdong is related with the important lithospheric extension event in southeast China (including Nanling region) at ca. 100 Ma. The "volcanic line" defined by the large scale Mesozoic intermediate-acidic volcanic magmatisms in southeast China may further extend to the southwest margin of Nanling region.

KW - Cretaceous

KW - Sr-Nd isotope

KW - Volcanic-intrusive rocks

KW - Western Guangdong

KW - Zircon U-Pb dating

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DO - 10.1007/s11430-006-0696-7

M3 - Journal Article (refereed)

VL - 49

SP - 696

EP - 713

JO - Science in China, Series D: Earth Sciences

JF - Science in China, Series D: Earth Sciences

SN - 1006-9313

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ER -