Two international zircon standards and one laboratory zircon standard were systematically measured using a Thermo Finngan Neptune MC-ICP-MS system and a New Wave UP213nm laser ablation system. The obtained Hf-176/Hf-177 ratios are 0.282700 +/- 64 (2SD, N = 22) for TEMORA, 0.282008 +/- 25 (2SD, N = 26) for GJ1 and 0.282967 +/- 44 (2SD, N = 27) for FM02. The results are in good agreement with the previously reported data within errors. Comparative measurements of the FM02 zircon standard using different ablation diameter show that the results are consistent within errors. Zircons GJ1 and FM02 show narrower variations in Hf-176/Hf-177 ratios than those of zircons TEMORA and thus are ideal standards for the Hf isotope analysis. The origin and material source of zircons from four different areas are also discussed based on the analysis of the Hf isotope compositions of zircons.
Lu-Hf is one of the isotopic dating and geochemical tracing techniques developed very rapidly during the past years. This paper presents a comprehensive review about the history, geochemical applications in petrology and remained problems surrounding the Lu-Hf isotope system. An overall introduction to the presently used sample digestion, mass spectrometric measurement and laser in-situ ablation techniques is also provided. The development of Hf isotopic systematics can be divided into 3 stages of TIMS, hot-SIMS and MC-ICP-MS, but the advent of MC-ICPMS accelerates their applications in petrology. After presenting the foundmantal geochemical behaviour and principles of the Lu-Hf isotope, this paper reviews its applications in petrology in details, including the isotopic dating of the garnet- and apatite-beraing rocks, early continental crustal formation and evolution, nature and petrogenesis of different mantle end-members, identification of various magmatic processes, regional geodynamic evolution and Hf iso
This paper, using gold deposits as example, attempts to setup a scientific linkage between ore geology and fluid inclusions, considering that in previous published works, observations and measurements of the fluid inclusions commonly were not well interpreted. In some cases, geological data did not agree with the results obtained from fluid inclusion studies. In this paper, we first review previous classifications of gold deposits, and then, subdivide gold deposits into five classes, based on the dominant ore-forming processes: 1) intrusion -related hypothermal systems, such as porphyry-systems, breccia-pipes, IOCG and skarns; 2) orogenic-or metamorphic hydrothermal type; 3) epithermal-type, i. e. reworking hydrothermal deposits hosted in continental-facies volcanic-subvolcanic rocks; 4) fine-grain disseminated type ( Carlin-type and/or Carlin-style), i. e. reworking hydrothermal deposits hosted sediments; and 5) hydrothermal metalliferous sediments related to submarine venting, such as VMS and SEDEX styles.
As a major component of continental crust, granites have been served as the most important subject in geology. Based on advancements obtained during past decades, this paper provides a comprehensive overview about the issues related to granitic formation. As for genetic types, the classifications between I-, S-and A-type granites are sometimes difficult, especially for those of highly fractionated rocks. It is stated that the concentrations of zirconium in whole-rock and titanium in zircon can be used to provided information on the temperature of partial melting and magma crystallization, but the pressure under which the source partially melted is hard to estimate. The granites are mostly occurred in the subduction zones and post-orogenic extensional settings, where the inputs of volatile and heat resulted in crustal partial melting of orogenic roots, and then the formation of granites. The traditionally used geochemical diagrams for the tectonic discrimination could not get right answer in most cases. This p