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Nd, Sr and O Isotopic Study on Spilite‐Keratophyre in Xiqiu, Zhejiang Province, China
Author(s) -
Weizhou Shen,
Bangtong Zhang,
Hongfei Ling,
Mingyuan Lai,
Jiedong Yang,
Xiancong Tao
Publication year - 1992
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1992.mp5002004.x
Subject(s) - geology , geochemistry , massif , proterozoic , subduction , radiometric dating , paleontology , tectonics
Nd, Sr and O isotopic study on the spilite‐keratophyre sequence in Xiqiu shows that its ? Nd values are in the range of 4.02–5.26, and its ? sr values, +1.4‐2.6. According to the points of these data in the ? Nd ‐T, ? Sr ‐T and ? Nd ‐? Sr diagrams, the spilite‐keratophyre is interpreted as being slightly contaminated by crustal materials. Its δ 18 O values are 3.9‐5.0% 0 . The depletion of 18 O in the rocks resulted from the influence of seawater hydro thermal alteration during or soon after the rock formation. Based on the isotopic characteristics and available geochemical data, it is believed that the spilite‐keratophyre was formed in the well‐developed island‐ arc environment during the Late Proterozoic subduction of the palaeo‐ Pacific plate beneath the southeastern margin of the Yangtze massif.