|Table of Contents|

Diagenetic Sequence, Petrogenesis and Prospecting Prospect of Tangshe Complex Pluton in the Northeastern Margin of Jiangnan Orogenic Belt, China(PDF)

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

Issue:
2021年第04期
Page:
643-660
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Diagenetic Sequence, Petrogenesis and Prospecting Prospect of Tangshe Complex Pluton in the Northeastern Margin of Jiangnan Orogenic Belt, China
Author(s):
ZHANG Jian-fang;  CAI Xiao-liang;  GONG Rui-jun;  LIU Yuan-dong;  WANG Zhen;  LIU Feng-long;  WANG Long-wu
(Zhejiang Institute of Geological Survey, Hangzhou 311203, Zhejiang, China)
Keywords:
geochemistry;  petrogenesis;  zircon U-Pb age;  diagenetic sequence;  prospecting prospect;  complex pluton;  Jiangnan orogenic belt
PACS:
P581; P597; P617
DOI:
10.19814/j.jese.2020.07029
Abstract:
In order to understand the diagenetic sequence, petrogenesis and prospecting prospect of Tangshe complex pluton in the northeastern margin of Jiangnan orogenic belt, the regional geological mapping, LA-ICP-MS zircon U-Pb age, and all-rock geochemical analysis were studied. According to the geological contact relationship, the diagenetic sequence of Tangshe complex pluton from early to late is determined as medium grained monzonitic granite, medium-coarse grained syenogranite, coarse-medium grained porphyritic syenogranite and fine grained syenogranite, respectively, and the diagenetic ages are(140.4±3.3),(131.7±3.2),(132.2±1.6), and(125.0±2.0)Ma.The rocks have the characteristics of high Si and alkali, low P and Ti, being metaluminum-weak peraluminous and high-K calc-alkaline series, which belong to I-type granites. In addition, the light and heavy rare earth elements are highly differentiated, and the chrondrite-normalized REE pattern leans to right with the enrichment of Rb, Th, U, and K, the depletion of Ba, Nb, Ta, Sr, P, and Ti, and the medium-strong negative Eu anomaly. Generally, the magmatic evolution from early to late shows that the contents of SiO2 and K2O, the ratio of K2O/Na2O, and A/CNK gradually increase, the contents of TiO2, Al2O3, TFeO, MgO, CaO, P2O5 gradually decrease, negative Eu anomaly gradually increases, and the degree of differentiation gradually increases. Tangshe complex pluton is the product of anticline tectonic emplacement after crystal-separation of the remelting of lower crustal material in the inland tension environment after the subduction-collision orogenic of paleo-Pacific plate.Types of mineralization and minerals in the contact zone of Tangshe complex pluton are characterized by W→Ag-Pb-Zn→Sb/fluorite zoning from inside to outside, which form a skarn-hydrothermal vein-type mineralization system with a good prospecting prospect.

References:

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Last Update: 2021-04-20