Geochemistry of Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi, China: arc or plume magmatism?

Jincheng Zhou; Xiaolei Wang; Jiansheng Qiu; Jianfeng Gao

Geochemistry of Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi, China: arc or plume magmatism?

Jincheng Zhou^*, Xiaolei Wang, Jiansheng Qiu, Jianfeng Gao

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

168 Citations (Scopus)

Abstract

Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi show mainly calc-alkaline features. The mafic rocks have (Nb/La)_pm ¹⁾ = 0.13∼0.51, (Th/La)_pm = 0.85∼3.3, Ti/Ti*²⁾ = 0.29∼0.79 and show negative Nb and Ti anomalies in primitive mantle normalized diagrams. The Mesoproterozoic mafic rocks have lower ε_Nd(T) than those of Neoproterozoic, -1.99 ∼ -5.13 vs. -0.74 ∼ 2.4, respectively. They plot in the field of volcanic arc basalt in tectonic discrimination diagrams and display geochemical signatures of island arc volcanics. The mafic-ultramafic rocks are thought to be the products of magmatism of convergent plate boundary rather than derived from mantle plume. Therefore, they can not be regarded as an indicator of breakup of Rodinia supercontinent.

Original language	English
Pages (from-to)	139-152
Number of pages	14
Journal	GEOCHEMICAL JOURNAL
Volume	38
Issue number	2
Publication status	Published - 2004

Keywords

Arc magmatism
Geochemistry
Mafic-ultramafic
Proterozoic
South China

Cite this

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title = "Geochemistry of Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi, China: arc or plume magmatism?",

abstract = "Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi show mainly calc-alkaline features. The mafic rocks have (Nb/La)pm 1) = 0.13∼0.51, (Th/La)pm = 0.85∼3.3, Ti/Ti*2) = 0.29∼0.79 and show negative Nb and Ti anomalies in primitive mantle normalized diagrams. The Mesoproterozoic mafic rocks have lower εNd(T) than those of Neoproterozoic, -1.99 ∼ -5.13 vs. -0.74 ∼ 2.4, respectively. They plot in the field of volcanic arc basalt in tectonic discrimination diagrams and display geochemical signatures of island arc volcanics. The mafic-ultramafic rocks are thought to be the products of magmatism of convergent plate boundary rather than derived from mantle plume. Therefore, they can not be regarded as an indicator of breakup of Rodinia supercontinent.",

keywords = "Arc magmatism, Geochemistry, Mafic-ultramafic, Proterozoic, South China",

author = "Jincheng Zhou and Xiaolei Wang and Jiansheng Qiu and Jianfeng Gao",

year = "2004",

language = "English",

volume = "38",

pages = "139--152",

journal = "GEOCHEMICAL JOURNAL",

issn = "0016-7002",

publisher = "Geochemical Society of Japan",

number = "2",

}

TY - JOUR

T1 - Geochemistry of Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi, China

T2 - arc or plume magmatism?

AU - Zhou, Jincheng

AU - Wang, Xiaolei

AU - Qiu, Jiansheng

AU - Gao, Jianfeng

PY - 2004

Y1 - 2004

N2 - Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi show mainly calc-alkaline features. The mafic rocks have (Nb/La)pm 1) = 0.13∼0.51, (Th/La)pm = 0.85∼3.3, Ti/Ti*2) = 0.29∼0.79 and show negative Nb and Ti anomalies in primitive mantle normalized diagrams. The Mesoproterozoic mafic rocks have lower εNd(T) than those of Neoproterozoic, -1.99 ∼ -5.13 vs. -0.74 ∼ 2.4, respectively. They plot in the field of volcanic arc basalt in tectonic discrimination diagrams and display geochemical signatures of island arc volcanics. The mafic-ultramafic rocks are thought to be the products of magmatism of convergent plate boundary rather than derived from mantle plume. Therefore, they can not be regarded as an indicator of breakup of Rodinia supercontinent.

AB - Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi show mainly calc-alkaline features. The mafic rocks have (Nb/La)pm 1) = 0.13∼0.51, (Th/La)pm = 0.85∼3.3, Ti/Ti*2) = 0.29∼0.79 and show negative Nb and Ti anomalies in primitive mantle normalized diagrams. The Mesoproterozoic mafic rocks have lower εNd(T) than those of Neoproterozoic, -1.99 ∼ -5.13 vs. -0.74 ∼ 2.4, respectively. They plot in the field of volcanic arc basalt in tectonic discrimination diagrams and display geochemical signatures of island arc volcanics. The mafic-ultramafic rocks are thought to be the products of magmatism of convergent plate boundary rather than derived from mantle plume. Therefore, they can not be regarded as an indicator of breakup of Rodinia supercontinent.

KW - Arc magmatism

KW - Geochemistry

KW - Mafic-ultramafic

KW - Proterozoic

KW - South China

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M3 - Article

AN - SCOPUS:2542437124

SN - 0016-7002

VL - 38

SP - 139

EP - 152

JO - GEOCHEMICAL JOURNAL

JF - GEOCHEMICAL JOURNAL

IS - 2

ER -

Geochemistry of Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi, China: arc or plume magmatism?

Abstract

Keywords

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