TY - GEN

T1 - Composition and age of basic dikes in the nastenka site of the malo-tarynskoye orogenic gold deposit (Verkhoyansk-kolyma folded region, northeast Russia)

AU - Zaitcev, Albert

AU - Fridovsky, Valery

AU - Yakovleva, Kyunney

AU - Kudrin, Maxim

AU - Vernikovskaya, Antonina

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Characteristic features of the petrographic and chemical compositions as well as the age of basic dikes in the Nastenka site of the Malo-Tarynskoe orogenic gold ore deposit (MTD), located in the central part of the Yana-Kolyma metallogenic belt, northeast Russia, are considered. The dikes are composed of light greenish-gray porphyritic rocks replaced by sericite-chlorite-albite-carbonate substance with ore and epidote components, in which relics and fragments of primary igneous minerals are noted. The obtained Rb-Sr erochron dates of the dikes rocks determine their age at 162±4 Ma (I0 = 0.7128 ± 0.0002), which suggests them to be the earliest magmatic formations of the Malo-Tarynskoe deposit. The calculated formation temperature for the whole rock samples (from Ti- and Zr-geobarometers) is between 747-787 °C and 671-709 °C. Intrusion of the dikes occurred under a relatively high oxygen fugacity (ΔNiO-Ni = -0.08 – +0.83), within the nickel-nickel buffer. The genetic connection of gold mineralization with deep magmatic chambers, which are the source of basic rocks of the dike complex at the Nastenka site of the Malo-Tarynskoe orogenic gold ore deposit, is assumed.

AB - Characteristic features of the petrographic and chemical compositions as well as the age of basic dikes in the Nastenka site of the Malo-Tarynskoe orogenic gold ore deposit (MTD), located in the central part of the Yana-Kolyma metallogenic belt, northeast Russia, are considered. The dikes are composed of light greenish-gray porphyritic rocks replaced by sericite-chlorite-albite-carbonate substance with ore and epidote components, in which relics and fragments of primary igneous minerals are noted. The obtained Rb-Sr erochron dates of the dikes rocks determine their age at 162±4 Ma (I0 = 0.7128 ± 0.0002), which suggests them to be the earliest magmatic formations of the Malo-Tarynskoe deposit. The calculated formation temperature for the whole rock samples (from Ti- and Zr-geobarometers) is between 747-787 °C and 671-709 °C. Intrusion of the dikes occurred under a relatively high oxygen fugacity (ΔNiO-Ni = -0.08 – +0.83), within the nickel-nickel buffer. The genetic connection of gold mineralization with deep magmatic chambers, which are the source of basic rocks of the dike complex at the Nastenka site of the Malo-Tarynskoe orogenic gold ore deposit, is assumed.

KW - Basites

KW - Malo-Tarynskoe deposit

KW - Physico-chemical formation parameters

KW - Rb-Sr isotopic age

UR - http://www.scopus.com/inward/record.url?scp=85073690167&partnerID=8YFLogxK

U2 - 10.5593/sgem2019/1.1/S01.013

DO - 10.5593/sgem2019/1.1/S01.013

M3 - Conference contribution

AN - SCOPUS:85073690167

T3 - International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM

SP - 99

EP - 108

BT - Education and Accreditation in Geosciences; Environmental Legislation, Multilateral Relations and Funding Opportunities

PB - International Multidisciplinary Scientific Geoconference

T2 - 19th International Multidisciplinary Scientific Geoconference, SGEM 2019

Y2 - 30 June 2019 through 6 July 2019

ER -