Data analysis of the U–Pb geochronology and Lu–Hf system in zircon and whole-rock Sr, Sm–Nd and Pb isotopic systems for the granitoids of Thailand

© 2018 This data article provides zircon U–Pb and Lu–Hf isotopic information along with whole-rock Sm–Nd, Sr and Pb isotopic geochemistry from granitoids in Thailand. The U–Pb ages are described and the classification of crystallisation and inherited ages are explained. The petrography of the granitoid samples is detailed. The data presented in this article are interpreted and discussed in the research article entitled “Probing into Thailand's basement: New insights from U–Pb geochronology, Sr, Sm–Nd, Pb and Lu–Hf isotopic systems from granitoids” (Dew et al., 2018)

PIXE/PIGE microanalysis of trace elements in hydrothermal magnetite and exploration significance: a pilot study.

Magnetite is a common iron oxide mineral in many giant ore deposits. However, chemical analyses of individual magnetite grains were hampered by high detection limits in electron probe microanalysis and use of techniques such as XRF or solution chemistry on mineral separates. Hear we present a pilot study of the geochemistry of magnetite using PIXE microanalysis, which reveals a correlation between its trace element concentrations and a variety of ore deposit types. This finding suggests that some element ratios (e.g., Sn/Ga, Al/Co) of magnetite may play a significant role as indicator elements to discriminate between the different ore deposit styles, particularly within magmatic-hydrothermal ore systems and to apply in mineral exploration. Further works are in progress in combination with LA ICP-MS study of magnetites at CODES to acquire more data to test our hypothesis.Australian Institute of Nuclear Science and Engineering (AINSE); Vacuum Society of Australia (VSA); Australian Research Council (ARC); Australian Research Network for Advanced Materials (ARNAM); JAVAC; Nanotechnology Network; ThermoFisher Scientifi

Tectonics and metallogeny of mainland Southeast Asia - a review and contribution

Abstract not availableKhin Zaw, Sebastien Meffre, Chun-Kit Lai, Clive Burrett, M. Santosh, Ian Graham, Takayuki Manaka, Abhisit Salam, Teera Kamvong, Paul Cromi

The Ban Houayxai epithermal Au-Ag deposit in the Northern Lao PDR: mineralization related to the Early Permian arc magmatism of the Truong Son Fold Belt

The Ban Houayxai Au-Ag deposit is located in the Truong Son Fold Belt in the northern Lao PDR, mainland SE Asia. The deposit is hosted within an Early Permian volcano-sedimentary unit which is a part of a Late Carboniferous-Early Permian (310-270. Ma) volcanic-plutonic sequence of the Truong Son Fold Belt. The main Au-Ag mineralization stages (i.e., Stages 2 and 3) at Ban Houayxai consist of hydrothermal veins/breccias associated with a carbonate-quartz-sulfides (pyrite-sphalerite-galena-chalcopyrite)-sericite-chlorite-electrum-native silver-stephanite mineral assemblage. Geochronological studies from LA-ICP-MS zircon U-Pb and adularia Ar-Ar and K-Ar dating identified Early Permian, Cretaceous and Eocene ages. The Early Permian age is related to the emplacement of the mineralized volcanic arc sequence, whereas the Cretaceous and Eocene ages represent resetting probably related to Yanshanian and/or Himalayan Orogenies. A regional tectonic reconstruction indicates that the Au-Ag epithermal deposit at Ban Houayxai was formed as a result of southward subduction of an oceanic crust attached to the South China Terrane beneath the Indochina Terrane during the Early Permian. From the metallogenic point of view, the recognition of the old epithermal system at Ban Houayxai implies that the Truong Son Fold Belt possesses high potential for the presence of deeper magmatic-related deposits such as porphyry and porphyry-related skarn deposits