Re-Os isochron age of Fankeng basalts from Fujian of SE China and its geological significance

Jincheng Zhou; Shaoyong Jiang; Xiaolei Wang; Jinghong Yang; Mengqun Zhang

doi:10.2343/geochemj.39.497

Re-Os isochron age of Fankeng basalts from Fujian of SE China and its geological significance

Jincheng Zhou^*, Shaoyong Jiang, Xiaolei Wang, Jinghong Yang, Mengqun Zhang

^*Corresponding author for this work

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

35 Citations (Scopus)

Abstract

Mesozoic basalts occur widely in SE China, with two major episodes of activity during the Middle Jurassic and Early Cretaceous. The exact age and mantle source character for the first eruption of basaltic magma during the Jurassic are not well constrained. In this paper we report, for the first time, Re-Os isotope data on these basalts. We sampled the Fankeng basalts in the Yongding basin of southwestern Fujian, SE China and separated the Fe-Ti oxide concentrates in them. Six samples of the Fe-Ti oxide concentrates yield a Re-Os isochron age of 175.4 ± 3.1 Ma with an initial ¹⁸⁷Os/¹⁸⁸Os ratio of 0.124 ± 0.014, corresponding to an initial γ_Os value of -1.44 at 175.4 Ma. The age suggests that the Fankeng basalts are products of Middle Jurassic magmatism. Both (¹⁸⁷Os/¹⁸⁸Os)_i and γ_Os values are near chondritic. Together with Sm-Nd isotope data of these basalts, we conclude that the Fankeng basaltic magma might be derived from depleted asthenospheric mantle. The near chondritic γ _Os and εNd(T) values may suggest interactions between asthenosphere and lithosphere during early Mesozoic in the area.

Original language	English
Pages (from-to)	497-502
Number of pages	6
Journal	GEOCHEMICAL JOURNAL
Volume	39
Issue number	6
DOIs	https://doi.org/10.2343/geochemj.39.497
Publication status	Published - 2005

Keywords

Fankeng in Fujian of China
Interactions between asthenosphere and lithosphere
Middle Jurassic
Re-Os isochron age
Tholeiites

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title = "Re-Os isochron age of Fankeng basalts from Fujian of SE China and its geological significance",

abstract = "Mesozoic basalts occur widely in SE China, with two major episodes of activity during the Middle Jurassic and Early Cretaceous. The exact age and mantle source character for the first eruption of basaltic magma during the Jurassic are not well constrained. In this paper we report, for the first time, Re-Os isotope data on these basalts. We sampled the Fankeng basalts in the Yongding basin of southwestern Fujian, SE China and separated the Fe-Ti oxide concentrates in them. Six samples of the Fe-Ti oxide concentrates yield a Re-Os isochron age of 175.4 ± 3.1 Ma with an initial 187Os/188Os ratio of 0.124 ± 0.014, corresponding to an initial γOs value of -1.44 at 175.4 Ma. The age suggests that the Fankeng basalts are products of Middle Jurassic magmatism. Both (187Os/188Os)i and γOs values are near chondritic. Together with Sm-Nd isotope data of these basalts, we conclude that the Fankeng basaltic magma might be derived from depleted asthenospheric mantle. The near chondritic γ Os and εNd(T) values may suggest interactions between asthenosphere and lithosphere during early Mesozoic in the area.",

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AU - Jiang, Shaoyong

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AU - Yang, Jinghong

AU - Zhang, Mengqun

PY - 2005

Y1 - 2005

N2 - Mesozoic basalts occur widely in SE China, with two major episodes of activity during the Middle Jurassic and Early Cretaceous. The exact age and mantle source character for the first eruption of basaltic magma during the Jurassic are not well constrained. In this paper we report, for the first time, Re-Os isotope data on these basalts. We sampled the Fankeng basalts in the Yongding basin of southwestern Fujian, SE China and separated the Fe-Ti oxide concentrates in them. Six samples of the Fe-Ti oxide concentrates yield a Re-Os isochron age of 175.4 ± 3.1 Ma with an initial 187Os/188Os ratio of 0.124 ± 0.014, corresponding to an initial γOs value of -1.44 at 175.4 Ma. The age suggests that the Fankeng basalts are products of Middle Jurassic magmatism. Both (187Os/188Os)i and γOs values are near chondritic. Together with Sm-Nd isotope data of these basalts, we conclude that the Fankeng basaltic magma might be derived from depleted asthenospheric mantle. The near chondritic γ Os and εNd(T) values may suggest interactions between asthenosphere and lithosphere during early Mesozoic in the area.

AB - Mesozoic basalts occur widely in SE China, with two major episodes of activity during the Middle Jurassic and Early Cretaceous. The exact age and mantle source character for the first eruption of basaltic magma during the Jurassic are not well constrained. In this paper we report, for the first time, Re-Os isotope data on these basalts. We sampled the Fankeng basalts in the Yongding basin of southwestern Fujian, SE China and separated the Fe-Ti oxide concentrates in them. Six samples of the Fe-Ti oxide concentrates yield a Re-Os isochron age of 175.4 ± 3.1 Ma with an initial 187Os/188Os ratio of 0.124 ± 0.014, corresponding to an initial γOs value of -1.44 at 175.4 Ma. The age suggests that the Fankeng basalts are products of Middle Jurassic magmatism. Both (187Os/188Os)i and γOs values are near chondritic. Together with Sm-Nd isotope data of these basalts, we conclude that the Fankeng basaltic magma might be derived from depleted asthenospheric mantle. The near chondritic γ Os and εNd(T) values may suggest interactions between asthenosphere and lithosphere during early Mesozoic in the area.

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Re-Os isochron age of Fankeng basalts from Fujian of SE China and its geological significance

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