Tectonic evolution of Southeast Asia

Abstract

The prominent N-S Palaeo-Tethys Bentong-Raub suture divides Peninsular Malaysia into a Sibumasu block on the west and an Indochina block on the east, known locally as East Malaya. The suture zone is characterized by an imbricated complex resembling an accretionary prism, of carbonaceous pelitic schist, serpentinite, amphibole schist, mélange-olistostrome and chert, as well as undated post-suture redbeds.

Petrochemistry of Granitoids in Sibolga and its Surrounding Areas, North Sumatra, Indonesia

“…The formation of A‐type granitoids at Sibolga and its surroundings within plate setting was a consequence of the regional extensional stress during that time. Sibolga and its surrounding areas were part of the west Sumatra block (Metcalfe, ; Searle et al, ; Subandrio, ; Hutchison, , ), which were moved to recent positions at the west of Sibumasu by tectonic translation of a strike slip mechanism (Metcalfe, ) along the medial Sumatra tectonic zone from the early Permian to the early Triassic. A dip slip component from the movement associated with the translation mechanism caused block stretching (McCaffrey, ) and possibly created spaces occupied by the granitoids (Gill, ).…”

“…Tectonic evolution of Sibolga and its surrounding areas (modified after Hutchison, 1994Hutchison, , 2014Metcalfe, 2000;Barber & Crow, 2003;Searle et al, 2012;Subandrio, 2012…”

Geochemical Study on An IOCG Deposit in the Lamandau Region, Kalimantan Island, Indonesia

“…The three zircon dating results are consistent with each other, showing the diorite porphyry in Lamandau region formed at the age of 78.7±2.3 Ma, which is interpreted as the formation time of the Lamandau diorite porphyry at the Late Cretaceous during Yanshannian. During the last two decades, geologists found a series of Cenozoic epithermal gold deposit in Kuching High, and preliminary researched the geodynamics (Hutchison, 1996;Soeria-Atmadja et al, 1999;Van Leeuwen, 1994). The Lamandau deposit is located south to the Kuching High on Sandaland.…”

Structural analysis and vein episode of the Penjom Gold Deposit, Malaysia: Implications for gold mineralisation and tectonic history in the Central Belt of Malaysia

“…U-Pb zircon ages from the Eastern Belt Granitoids range from Middle Permian to Early-Late Triassic (Searle et al, 2012). Continuous sedimentation which occurs during this period is represented by the Permian Gua Musang and Triassic Semantan formations within the forearc basin (Hutchison, 2007). Kuroko type sulphide occurrence or submarine exhalative such as Tasik Chini (Yeap, 1993), base metal deposit including Galena and Monson's Lode of Ulu Sokor, and Mengapor (porphyry copper Au skarn) were classified as volcanic arc-related mineralisation (Hutchison, 2009) occurring in the eastern side of the Central Belt.…”