eCite Digital Repository

Geology, geochemistry and genesis of the Makou magnetite-apatite deposit in the Luzong volcanic basin, Middle-Lower Yangtze River Valley Metallogenic Belt, Eastern China

Citation

Nie, L and Zhou, T and Fan, Y and Zhang, L and Cooke, D and White, N, Geology, geochemistry and genesis of the Makou magnetite-apatite deposit in the Luzong volcanic basin, Middle-Lower Yangtze River Valley Metallogenic Belt, Eastern China, Ore Geology Reviews, 91 pp. 264-277. ISSN 0169-1368 (2017) [Refereed Article]


Preview
PDF (Journal article - Ore Geology Reviews)
Pending copyright assessment - Request a copy
4Mb
  

DOI: doi:10.1016/j.oregeorev.2017.09.022

Abstract

The Middle-Lower Yangtze River Valley Metallogenic Belt (MLYB) is located on the northern margin of the Yangtze Plate (Eastern China). Ore deposits in the belt are mainly clustered in seven ore districts, and are closely associated with Mesozoic intermediate-felsic magmatic rock. Among the seven ore districts, the Luzong and Ningwu districts host large-scale iron resources in volcanic basins. The Makou magnetite-apatite deposit in the southern Luzong Basin was previously interpreted to be related to a quartz syenite porphyry. In this study, we conducted field geological studies and determined the age and geochemistry of the Makou intrusive rocks. Petrography and electron probe micro analysis (EPMA) indicated that the Makou ore-hosting rocks have intense albite alteration. The wallrock alteration is spatially restricted, and comprises albite alteration (Stage I), magnetite mineralization (Stage II), quartz-sulfide alteration (Stage III) and carbonate alteration (Stage IV) stages. Fluid inclusions in syn-mineralization apatite homogenized at 252.2322.6 C, which slightly lower than is typical for magnetite-apatite deposits in the region. Field study revealed that the quartz syenite porphyry at Makou disrupted the orebodies along clear-cut intrusive contacts, and that the quartz syenite porphyry does not contain iron mineralization, suggesting it has no direct genetic relationship with the iron mineralization. The ore-hosting albitite and ore-forming biotite diorite have LA-ICP-MS zircon U-Pb ages of 129.6  1.2 Ma and 131.2  3.3 Ma, respectively, and the iron mineralization was dated by mass spectrometer phlogopite 40Ar-39Ar at 130.76  0.77 Ma. We propose that the Makou magnetite-apatite deposit is genetically related to the biotite diorite, rather than to the quartz syenite porphyry in the mine pit. The biotite diorite closely resembles intrusions related to magnetite-apatite deposits elsewhere in the region.

Item Details

Item Type:Refereed Article
Keywords:magnetite, apatite, China, zircon geochronology, fluid inclusions
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Iron Ore Exploration
Author:Zhang, L (Mr Lejun Zhang)
Author:Cooke, D (Professor David Cooke)
ID Code:122942
Year Published:2017
Funding Support:Australian Research Council (CE0561595)
Deposited By:CODES ARC
Deposited On:2017-12-06
Last Modified:2017-12-07
Downloads:0

Repository Staff Only: item control page