The Age and Geochemical Characteristics of Neoproterozoic Gneissic Moyite in the Xiaotian Basin

WAN Qiu; LI Yan-he; WANG Li-min; DUAN Chao; SHI Ke; TAN De-xing

doi:10.15898/j.cnki.11-2131/td.201908120125

Rock and Mineral Analysis > 2020 > 39(4): 620-630. > DOI: 10.15898/j.cnki.11-2131/td.201908120125

WAN Qiu, LI Yan-he, WANG Li-min, DUAN Chao, SHI Ke, TAN De-xing. The Age and Geochemical Characteristics of Neoproterozoic Gneissic Moyite in the Xiaotian Basin[J]. Rock and Mineral Analysis, 2020, 39(4): 620-630. DOI: 10.15898/j.cnki.11-2131/td.201908120125

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The Age and Geochemical Characteristics of Neoproterozoic Gneissic Moyite in the Xiaotian Basin

WAN Qiu^1,2,3,,
LI Yan-he^1, ,,
WANG Li-min^2,3,
DUAN Chao¹,
SHI Ke^2,3,
TAN De-xing^2,3

1.
Institute of Mineral Resources, Chinese Academy of Geological Sciences; Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources, Beijing 100037, China
2.
Geological Survey of Anhui Province, Hefei 230001, China
3.
The Coverage Area Deep Resource Exploration Engineering Technology Innovation Center, Ministry of Natural Resources, Hefei 230001, China

More Information

Received Date: August 11, 2019
Revised Date: September 16, 2019
Accepted Date: October 20, 2019
Published Date: June 30, 2020

Abstract

HIGHLIGHTS
(1) Neoproterozoic gneissic moyite was discovered for the first time on the surface of the Xiaotian volcanic basin.

ABSTRACT

BACKGROUNDThe zircon U-Pb dating and analysis of major, trace and rare earth elements of rocks are the main research methods used to study the genesis of intrusive rocks.
OBJECTIVESTo constrain the genesis of neoproterozoic gneissic moyite of the Yangsanzhai, Xiaotian volcanic basin.
METHODSChemical composition of rocks was analyzed by X-ray fluorescence spectrometry (XRF), inductively coupled plasma-mass spectrometry (ICP-MS), and the zircon U-Pb age was determined by laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS).
RESULTSResults show that the rock was characterized by high silicon, kalium and sodium, and low iron, magnesium, calcium and phosphorus. The content of SiO₂, Al₂O₃, MgO, K₂O and Na₂O were 65.86%-78.29%, 10.89%-16.02%, 0.17%-1.17%, 1.37%-6.44% and 0.53%-6.50%, respectively. The rock belonged to the high potassic calc-alkaline series. The samples were characterized by depletion of Nb, Sr, P and Ti, and enrichment of La, Ce, Nd and Zr. The samples had high content of rare earth elements (ΣREE=152.70-650.88μg/g) with light rare earth enrichment (LREE/HREE=6.77-20.64). Most of the samples had weakly negative europium anomalies (δEu=0.29-1.15) without cerium anomaly. The normalized curve of rare earth elements was characterized by right-incline. The ²⁰⁶Pb/²³⁸U ages of the 30 zircon points ranged from 720 to 828Ma, with a weighted average age of 776±11Ma (MSWD=2.1).
CONCLUSIONSThe discovery of Neoproterozoic gneissic moyite in the Xiaotian Basin indicates that there is uplift in the center of this basin, not the 'bucket' shape of thick in the middle and thin at the sides, as previously recognized. This has important guiding significance for the understanding of the tectonic morphology of the basin and further prospecting.
- gneissic moyite,
- major elements,
- trace elements,
- rare earth elements,
- U-Pb dating,
- zircon age

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The Age and Geochemical Characteristics of Neoproterozoic Gneissic Moyite in the Xiaotian Basin

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