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Minerals 2018, 8(7), 270; https://doi.org/10.3390/min8070270

Multi-Stage Deformation of the Khangalas Ore Cluster (Verkhoyansk-Kolyma Folded Region, Northeast Russia): Ore-Controlling Reverse Thrust Faults and Post-Mineral Strike-Slip Faults

1
Diamond and Precious Metal Geology Institute, SB RAS, Yakutsk 677000, Russia
2
M.K. Ammosov North-Eastern Federal University, Yakutsk 677000, Russia
*
Author to whom correspondence should be addressed.
Received: 4 May 2018 / Revised: 19 June 2018 / Accepted: 22 June 2018 / Published: 26 June 2018
(This article belongs to the Special Issue Structural Control of Mineral Deposits: Theory and Reality)
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Abstract

This study reports the results of the analysis of multi-stage deformation structures of the Khangalas gold ore cluster, northeast Russia. Four Late Mesozoic-Early Eocene deformation stages were identified. The first deformation event (D1) was characterized by the development of NW-striking tight to isoclinal folds of the first generation (F1) and interstratal detachment thrusts. Major folds, extensive thrusts, boudinage, cleavage, auriferous mineralized fault zones and quartz-vein gold mineralization were formed in the reverse and thrust fault stress field during the progressive deformation stage (D1), with NE-SW-oriented σ1. Post-ore deformation is widely manifested in the region. Structures D2 and D3 are coaxial. Sinistral strike-slip motions (D2 and D3) occurred along NW-trending faults under prevailing W-E compression. They were accompanied by the formation of NS- and NE-striking F2–3 folds with steep hinges and by bending of the earlier formed structures, among them ore-controlling ones. The last deformation event (D4) was represented by normal-dextral strike-slip faulting, refolding of rocks, pre-existing structures and ore bodies and by the development of folds with steep hinges. Key structural elements of varying age are described, the chronology of deformation events and mineralization reconstructed and their relation to geodynamic events in northeast Asia established. View Full-Text
Keywords: Verkhoyansk-Kolyma folded region; Khangalas ore cluster; orogenic gold mineralization; deformation structure; thrust fault; strike-slip fault Verkhoyansk-Kolyma folded region; Khangalas ore cluster; orogenic gold mineralization; deformation structure; thrust fault; strike-slip fault
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Fridovsky, V.Y.; Kudrin, M.V.; Polufuntikova, L.I. Multi-Stage Deformation of the Khangalas Ore Cluster (Verkhoyansk-Kolyma Folded Region, Northeast Russia): Ore-Controlling Reverse Thrust Faults and Post-Mineral Strike-Slip Faults. Minerals 2018, 8, 270.

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