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LA-ICP-MS Zircon U-Pb Age and Geochemistry of Gabbros from the Huanghuatan Copper-Nickel Deposit, Inner Mongolia
- Source :
- Yankuang ceshi, Vol 35, Iss 2, Pp 208-216 (2016)
- Publication Year :
- 2016
- Publisher :
- Science Press, PR China, 2016.
-
Abstract
- A series of ultrabasic-acid igneous rocks are distributed in the belt of Urad houqi-Damaoqi-Siziwangqi, in middle Inner Mongolia. The formation age and geochemistry of these rocks can provide basic geological information for the metallogenic regularities of Cu-Ni deposits related to ultrabasic-basic rocks. The age and geochemistry can also be used to infer the tectonic setting during magma emplacement. The Huanghuatan copper-nickel deposit in Damaoqi was selected for this research. Because of less fractures, high transparency, uniform cathodoluminescence and clear oscillatory zonings, zircon U-Pb dating is prior to be tested on LA-ICP-MS. The result yielded a weighted age of 262.4±1.1 Ma. The geochemical characteristics investigated by X-ray Fluorescence Spectrometry (XRF) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) indicate that Huanghuatan gabbros may have formed in a post-collision tensional environment. Combining with previous studies, it is suggested that the central region of Inner Mongolia had entered into the post-collision stage during the late Permian (255-275 Ma), whereas the close of Paleo-Asian Ocean in this limited area occurred before late Permian (about 285 Ma). This conclusion provides the upper time limit for the close of Paleo-Asian Ocean and the tectonic setting of the central part of Inner Mongolia during middle-late Permian.
Details
- Language :
- English, Chinese
- ISSN :
- 02545357
- Volume :
- 35
- Issue :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- Yankuang ceshi
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.08daace2f2cf401ab73d0ecd9f9bdfcd
- Document Type :
- article
- Full Text :
- https://doi.org/10.15898/j.cnki.11-2131/td.2016.02.014