TY - JOUR

T1 - 40 Ar/ 39 Ar age of alkaline rocks of verkhneamginskiy massif (aldan shield, south yakutia)

AU - Ponomarchuk, Anton V.

AU - Prokopyev, Ilya R.

AU - Doroshkevich, Anna G.

AU - Egitova, Irina V.

AU - Kravchenko, Alexander A.

AU - Ivanov, Alexey I.

N1 - Publisher Copyright: © Polish Academy of Sciences. All rights reserved.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The relevance of the research is caused by the need to expand mineral resources base, including gold8bearing ores. Large alkaline pro8 vinces, like Aldan8Stanovoy shield, are of interest because gold8bearing ores usually related to alkaline rock. They may form large and even giant deposits. Verkhneamginskiy massif is located in Verkhneamginskiy ore field in Aldan8Stanovoy shield. Verkhneamginskiy ore field is the part of large Charo8Aldan metallogenic zone, its length is more than 700 km from west to east. A characteristic feature of the Verkhneamginskiy ore region is its association with the Amginsky submeridional structural zone of the tectonic melange separating the Central Aldan compound terrain in the East from the West Aldan and Tynda composite terrains in the West and South, respectively. The main aim of the research is to detect the main rock types of Verkhneamginskiy massif, to study the features of structure and com8 position and to identify the age of massif crystallization as well as to compare the results with the available geochronological data on Mesozoic magmatism of the Aldan shield. Methods: petrographic study and 40Ar/39Ar dating by the step heating method by phlogopite monofractions. Results. The main phases of Mesozoic alkaline magmatism are leucocratic syenites and mesocratic lamprophyres. Using the 40 Ar/ 39 Ar da8 ting of phlogopite monofraction the authors have determined two discrete impulses: (1) 129,1.5±2,5 Ma emplacement of syenites; (2) 117,7±3,4 Ma emplacement of lamprophyre dikes. Mesozoic magmatism, manifested in Verkhneamginskiy area, demonstrates similar age boundaries with magmatic processes shown in the Aldan shield in the Mesozoic era.

AB - The relevance of the research is caused by the need to expand mineral resources base, including gold8bearing ores. Large alkaline pro8 vinces, like Aldan8Stanovoy shield, are of interest because gold8bearing ores usually related to alkaline rock. They may form large and even giant deposits. Verkhneamginskiy massif is located in Verkhneamginskiy ore field in Aldan8Stanovoy shield. Verkhneamginskiy ore field is the part of large Charo8Aldan metallogenic zone, its length is more than 700 km from west to east. A characteristic feature of the Verkhneamginskiy ore region is its association with the Amginsky submeridional structural zone of the tectonic melange separating the Central Aldan compound terrain in the East from the West Aldan and Tynda composite terrains in the West and South, respectively. The main aim of the research is to detect the main rock types of Verkhneamginskiy massif, to study the features of structure and com8 position and to identify the age of massif crystallization as well as to compare the results with the available geochronological data on Mesozoic magmatism of the Aldan shield. Methods: petrographic study and 40Ar/39Ar dating by the step heating method by phlogopite monofractions. Results. The main phases of Mesozoic alkaline magmatism are leucocratic syenites and mesocratic lamprophyres. Using the 40 Ar/ 39 Ar da8 ting of phlogopite monofraction the authors have determined two discrete impulses: (1) 129,1.5±2,5 Ma emplacement of syenites; (2) 117,7±3,4 Ma emplacement of lamprophyre dikes. Mesozoic magmatism, manifested in Verkhneamginskiy area, demonstrates similar age boundaries with magmatic processes shown in the Aldan shield in the Mesozoic era.

KW - Ar/ Ar dating.

KW - Aldan shield

KW - Aldan8Stanovoy shield

KW - Alkaline rock

KW - Mesozoic

KW - petrography

KW - Verhneamginskiy massif

KW - Verhneamginskiy ore field

KW - Ar-40/Ar-39 dating

KW - Verhneamginskiy massif. Verhneamginskiy ore field

KW - alkaline rock

KW - Aldan-Stanovoy shield

UR - http://www.scopus.com/inward/record.url?scp=85063787602&partnerID=8YFLogxK

U2 - 10.18799/24131830/2019/3/161

DO - 10.18799/24131830/2019/3/161

M3 - Article

AN - SCOPUS:85063787602

VL - 330

SP - 28

EP - 39

JO - Известия Томского политехнического университета. Инжиниринг георесурсов

JF - Известия Томского политехнического университета. Инжиниринг георесурсов

SN - 2500-1019

IS - 3

ER -