Louis Raimbault

Geology and Metallogeny of the Shizhuyuan Skarn-Greisen Deposit, Hunan Province, China

The Shizhuyuan deposit is the largest among the economically important polymetallic tungsten deposits in China. The deposit occurs within the thermal aureole of Yanshanian felsic intrusions that were emplaced into Devonian carbonates and marls. The mineralization can be divided into three phases that are genetically associated with three episodes of granitic emplacement-pseudoporphyritic biotite granite, equigranular biotite granite, and granite porphyry. During the emplacement of pseudoporphyritic biotite granite, thermal metamorphism and subsequent skarnization developed around the stock. The pure limestone was transformed to marble, whereas marls and argillite interlayers were changed to a series of metamorphic rocks such as grossular-diopside hornfels, wollastonite hornfels, diopside hornfels, wollastonite-vesuvianite hornfels, muscovite-K-feldspar-anorthite hornfels, and prehnitevermiculite hornfels. Because of the subsequent strong skarn development, most hornfelses later were transformed into skarn...

Consequence of 154Eu interference on INAA determination of Zr

Abstract It is shown that 154 Eu interference on the INAA determination of Zr may become quite large when dealing with mineral separates. Neglecting this correction may lead to erroneous Zr results and as a consequence, too high Zr/Hf ratios.