| 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 |
|
View Full Text
View/Add Comment
EndNote
BibTeX
Download reader |
| The Age and Geochemical Characteristics of Neoproterozoic Gneissic Moyite in the Xiaotian Basin |
| Received:August 12, 2019 Revised:September 17, 2019 |
| DOI：10.15898/j.cnki.11-2131/td.201908120125 |
| Key words: gneissic moyite major elements trace elements rare earth elements U-Pb dating zircon age |
| Author Name | Affiliation | E-mail | | WAN Qiu | Institute of Mineral Resources, Chinese Academy of Geological Sciences
Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources, Beijing 100037, China
Geological Survey of Anhui Province, Hefei 230001, China
The Coverage Area Deep Resource Exploration Engineering Technology Innovation Center, Ministry of Natural Resources, Hefei 230001, China | | | LI Yan-he | Institute of Mineral Resources, Chinese Academy of Geological Sciences
Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources, Beijing 100037, China | lyh@cei.gov.cn | | WANG Li-min | Geological Survey of Anhui Province, Hefei 230001, China
The Coverage Area Deep Resource Exploration Engineering Technology Innovation Center, Ministry of Natural Resources, Hefei 230001, China | | | DUAN Chao | Institute of Mineral Resources, Chinese Academy of Geological Sciences
Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources, Beijing 100037, China | | | SHI Ke | Geological Survey of Anhui Province, Hefei 230001, China
The Coverage Area Deep Resource Exploration Engineering Technology Innovation Center, Ministry of Natural Resources, Hefei 230001, China | | | TAN De-xing | Geological Survey of Anhui Province, Hefei 230001, China
The Coverage Area Deep Resource Exploration Engineering Technology Innovation Center, Ministry of Natural Resources, Hefei 230001, China | |
|
| Hits: 178 |
| Download times: 108 |
| Abstract: |
BACKGROUND: The 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.
OBJECTIVES: To constrain the genesis of neoproterozoic gneissic moyite of the Yangsanzhai, Xiaotian volcanic basin.
METHODS: Chemical 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).
RESULTS: Results 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).
CONCLUSIONS: The 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. |
|
|
|
|
