10.6084/M9.FIGSHARE.13507413.V1
Yanguang Li
Yanguang
Li
Shuguang Song
Shuguang
Song
Xiaoyong Yang
Xiaoyong
Yang
Zi-Fu Zhao
Zi-Fu
Zhao
Jinlong Dong
Jinlong
Dong
Xiaofeng Gao
Xiaofeng
Gao
Michael T.D. Wingate
Michael T.D.
Wingate
Chao Wang
Chao
Wang
Meng Li
Meng
Li
Mengqi Jin
Mengqi
Jin
Age and composition of Neoproterozoic diabase dykes in North Altyn Tagh, northwest China: implications for Rodinia break-up
<p>Whether or not the Altyn Tagh terranes in northwest China were part of the Rodinia supercontinent is unclear due to the apparent absence of rift-related igneous rocks. We present U-Pb geochronology, mineral chemistry, whole-rock major and trace element and Sr-Nd isotope data for the Yapuqiasayi mafic dykes in the North Altyn Tagh. Zircon and baddeleyite from a mafic dyke sample yield indistinguishable U-Pb results and a weighted mean <sup>207</sup>Pb/<sup>206</sup>Pb date of 740 ± 11 Ma, interpreted as the igneous crystallization age. The dykes are tholeiitic in composition, with high TiO<sub>2</sub>, Zr/Sm and Zr/Y, resembling intraplate basalts. Whole-rock major and trace elements, together with Sr and Nd isotope data, indicate that the dyke magmas originated by 3–5% partial melting of a garnet-poor (<1%) asthenospheric mantle source and were variably modified by crustal contamination. These features, together with mineral chemistry and field observations, indicate that these mafic dykes formed in a continental rift setting, possibly induced above a mantle plume. We show that the Yapuqiasayi dykes are similar in age and petrogenetic characteristics to mafic igneous rocks in Australia, South China, Seychelles, Laurentia, and Tarim, and speculate that their emplacement in North Altyn Tagh was associated with rifting and break-up of the Rodinia supercontinent above a Neoproterozoic superplume.</p>
Biochemistry
Neuroscience
Environmental Sciences not elsewhere classified
Chemical Sciences not elsewhere classified
Developmental Biology
Cancer
Inorganic Chemistry
Plant Biology
Taylor & Francis
2020
2020-12-31
2024-02-22
Dataset
165330 Bytes
10.6084/m9.figshare.13507413
10.1080/00206814.2020.1857851
CC BY 4.0