tailieunhanh - Trace elements and oxygen isotopes of gem spinels in marble from the Luc Yen - An Phu areas, Yen Bai province, North Vietnam

The variation of 18O values ( | Vietnam Journal of Earth Sciences, 40(2), 165-177, Doi: Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences (VAST) Trace elements and oxygen isotopes of gem spinels in marble from the Luc Yen - An Phu areas, Yen Bai province, North Vietnam Pham Van Long*1, Gaston Giuliani2, Anthony E. Fallick3, Andrian J. Boyce3, Vincent Pardieu4 1 Institute for Gems and Gold Research of VINAGEMS (IGG), Hanoi, Vietnam Université de Lorraine, IRD and CRPG UMR 7358 CNRS-UL, BP 20, 15 rue Notre-Dame-des-Pauvres, 54501 Vandœuvre-lès-Nancy, France 3 Isotope Geosciences Unit, ., Rankine Avenue, East Kilbride,Glasgow G75 0QF, Scotland, United Kingdom 4 Field gemmologist, Bangkok, Thailand 2 Received 16 January 2018; Received in revised form 16 March 2018; Accepted 22 March 2018 ABSTRACT Trace elements investigated by electron microprobe analysis (EMPA) have been combined with oxygen isotopic composition of pink, red and other colored spinels (blue, purple, brown, orange, lavender) hosted by marbles and found in placers from Luc Yen and An Phu deposits, Yen Bai province, North Vietnam. The deposits are those from Nuoc Ngap, Cong Troi, Bai Son and different placers from the An Phu area. Trace elements such as Fe-Zn-Cr-V in red and pink gem spinels permit to separate those from Cong Troi and those from the others deposits of the An Phu area. Spinels from Cong Troi have low to extremely low Zn (< 500 ppm) and high Fe contents (3,000 to 16,000 ppm) while those from An Phu area are Zn-rich (up to 11,000 ppm). Iron is the dominant element for the other colored spinels whereas Zn, Cr and V contents are extremely variable. The Bai Son blue spinel is Fe-rich (5,000 to 7,200 ppm) with some V (950 to 1,830 ppm), Cr (270 to 480 ppm), Co (240 to 400 ppm) and Ni (550 to 950 ppm). The O-isotope composition of the whole spinels ranges between and ‰ (n = 25). Within each deposit, the range of 18O

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