|Table of Contents|

Zircon Morphology and Geochemistry Characteristics of Dewulu Intrusive Complex in Gannan Area of Gansu, China and Their Diagenetic Indications(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2025年第02期
Page:
199-215
Research Field:
基础地质与矿床地质
Publishing date:

Info

Title:
Zircon Morphology and Geochemistry Characteristics of Dewulu Intrusive Complex in Gannan Area of Gansu, China and Their Diagenetic Indications
Author(s):
ZHENG Yong-tao1; 2;  WANG Shu-zhi1; 2*;  WANG Tao3;  XUN Hao-tian1; 2;  TIAN Ying4
(1. School of Emergency Management and Safety Engineering, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. Tangshan Key Laboratory of Geological Resource Development and Disaster Prevention, North China University of Science and Technology, Tangshan 063210, Hebei, China; 3. Chinese Academy of Geological Sciences, Beijing 100037, China; 4. Institute of Regional Geological Survey of Hebei Province, Langfang 065000, Hebei, China)
Keywords:
Au-Cu deposit;  metallogenic pattern;  zircon morphology;  rare earth element;  mafic microgranular enclave;  crust-mantle interacting;  mineralization potential;  Gansu
PACS:
P572; P612
DOI:
10.19814/j.jese.2024.12016
Abstract:
The Dewulu complex is composed of Dewulu quartz diorite and the Laodou quartz diorite porphyry. The differences between the two plutons in terms of intrusion age and mineralization type indicate that their petrogenesis have important guiding significance for regional mineralization patterns and deep prospecting. The petrogenesis of Dewulu intrusive complex in Gannan area of Gansu and its mafic microgranular enclaves were systematically investigated through statistical analysis of zircon crystal morphology and LA-ICP-MS rare earth element(REE)testing, combined with field observations and petrographic analysis. The results show that Dewulu quartz diorite is more alkali-rich compared to Laodou quartz diorite porphyry, with the chondrite-normalized REE pattern in its zircon exhibiting characteristics of light rare earth element(LREE)depletion and heavy rare earth element(HREE)enrichment, along with a significant positive Ce anomaly(δCe=16.68)and negative Eu anomaly(δEu=0.11); in contrast, Laodou quartz diorite porphyry shows a higher positive(δCe=31.30), and its biotite content(15%-20%)is significantly higher than that of Dewulu quartz diorite(10%-15%), reflecting a more water-rich magma characteristic of Laodou quartz diorite porphyry; the average point distribution and evolutionary trends of typomorphic population in zircon indicates that zircons from both rock types project into a mixed-source calc-alkaline field on zircon classification diagrams, confirming that both have experienced crust-mantle magma mixing processes; the consistency in the chondrite-normalized REE pattern between the inclusions and the host rocks(the contents of REE are(351-628)×10-6)further suggests that they are products of consanguineous magmatic evolution; mineralization potential indicates that the higher oxygen fugacity and water content in Laodou quartz diorite porphyry are more favorable for Au-Cu mineralization, providing important theoretical basis for regional deep mineral exploration.

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Last Update: 2025-03-20