Deformation of the Cablac Mountain Range, East Timor: An overthrust stack derived from an Australian continental terrace

Keep, Myra; Barber, Logan; Haig, David W.

doi:10.1016/j.jseaes.2009.02.001

Cited by 13 publications

(10 citation statements)

References 53 publications

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“…The current geological map for the region [ Audley‐Charles , ] shows that Gondwana Megasequence lies to the NW of the Mata Bia massif and that the Mata Bia massif is a klip of Banda Terrane sedimentary cover [ Audley‐Charles , ]. However, similar massifs of the Banda Terrane, including Mts Cablac, Perdido, and Laritame (Figure ), have since been shown to be cored by exhumed Gondwanan rocks and surrounded by Banda Terrane [e.g., Haig et al ., ; Keep et al ., ; Keep and Haig , ; Benincasa et al ., ].…”

Section: Synorogenic Structure Kinematics and Lineaments Of Timor Lmentioning

confidence: 99%

“…In West Timor, much of the contraction has been attributed to diapir intrusion and mud volcanism localized along transtensional faults [ Kenyon , ; Barber et al ., ]. Major Pleistocene normal faults have been recognized in many parts of Timor, including the Kolbano region [ Harris et al ., , Figure ] within the Banda Terrane [ Standley and Harris , ], the north sides of Mts Cablac and Perdido [ Keep et al ., ; Keep and Haig , ], and the sinistral normal Laclo fault [ Berry and Grady , ; Harris , ]. However, the kinematics of this faulting is poorly understood.…”

Section: Geological Setting and Previous Workmentioning

confidence: 99%

“…The stratigraphy within this stack youngs southward, which is consistent with upward ramping of the decollement in the underthrust continental margin units. Some out of sequence thrusts break through the duplex stack and its Banda Terrane roof thrust, emplacing Gondwanan rocks over the Banda Terrane at Mt Cablac (Figures a and b) [ Keep et al ., ].…”

Section: Synorogenic Structure Kinematics and Lineaments Of Timor Lmentioning

confidence: 99%

“…Approximately 50 km SW of the Lacluta fault, Keep et al . [] documented a north‐dipping high‐angle normal fault (the Cablac fault) that drops the Banda Terrane of the Bebe Susu massif (BS Figure ) down against Gondwanan rocks on the northern slopes of Mt Cablac (C on Figure ). The Cablac fault forms a clear trace on airphotos that can be tracked eastward along the southern boundary of the Bebe Susu Massif and westward as a discontinuous series of en‐echelon structures that extend as far west as the Marobo graben (fine dotted line Figure ).…”

Section: Synorogenic Structure Kinematics and Lineaments Of Timor Lmentioning

confidence: 99%

“…The timing of the collision is controversial and estimates presently range from ~3 to >8 Ma [ Keep and Haig , ; Audley‐Charles , ]. Geophysical and field observations, along with shallow seismicity, show evidence of syn‐collisional extension in Timor [ Berry and Grady , ; Price and Audley‐Charles , ; McCaffrey , ; ; Charlton , ; Charlton et al ., ; Harris , ; Masson et al ., ; Harris , ; Harris and Wu , ; Charlton , ; Keep et al ., ; Keep and Haig , ] (Figure ). The mechanism and effects of this extension are unclear.…”

Section: Introductionmentioning

confidence: 99%

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Arc‐parallel extrusion of the Timor sector of the Banda arc‐continent collision

et al. 2013

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[1] Structural studies of synorogenic basins in Timor using field and remote sensing techniques provide new structural and geomorphic evidence for syn-collisional extension in the converging plate boundary zone between the Australian Plate and Banda Arc. Fault mapping and kinematic analysis at scales ranging from outcrop (<1 m 2 ) to the dimensions of the active orogen in East Timor (~100 km 2 ) identify a predominance of NW-SE oriented dextral-normal faults and NE-SW oriented sinistral-normal faults that collectively bound large (5-20 km 2 ) bedrock massifs throughout the island. These fault systems intersect at non-Andersonian conjugate angles of approximately 120 and accommodate an estimated 20 km of NE-directed extension across the Timor orogen based on reconstructions of fault-dismembered massifs. Major orogen-parallel ENE-oriented faults on the northern and southern sides of Timor exhibit normal-sinistral and normal-dextral kinematics, respectively. The overall pattern of deformation is one of lateral crustal extrusion sub-parallel to the Banda Arc. Stratigraphic relationships suggest that extrusion began prior to 5.5 Ma, before pronounced rapid uplift of the orogen. We link this to progressive coupling of the fore-arc to an underthrust plateau on the Australian Plate and subduction of its ocean crust. Our results enable us to track the structural evolution of the upper crust during dramatic plate-boundary reorganizations accompanying the transition from subduction to collision. The deformation structures that we document suggest that both upper and lower plate deformation during incipient island arc-continent collision was largely controlled by the geometry and topography of the lower plate.

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Section: Synorogenic Structure Kinematics and Lineaments Of Timor Lmentioning

confidence: 99%

Section: Geological Setting and Previous Workmentioning

confidence: 99%

Section: Synorogenic Structure Kinematics and Lineaments Of Timor Lmentioning

confidence: 99%

Section: Synorogenic Structure Kinematics and Lineaments Of Timor Lmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Arc‐parallel extrusion of the Timor sector of the Banda arc‐continent collision

et al. 2013

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Environmental geology assessment on the regional Pitay landfill site: a case study in Kupang, Indonesia

Titu-Eki

Kotta

2021

SN Appl. Sci.

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The Provincial Government of East Nusa Tenggara of Eastern Indonesia has intended to construct a new regional landfill site in Pitay–Kupang, which would accommodate municipal waste of two cities. Considering that environmental degradation in landfill sites has been a substantial issue for many developing cities in Indonesia, this study evaluates the pre-determined site on a local scale based on environmental geology parameters. It employs a conventional Geographical Information System based—Multi-Criteria Decision Analysis (GIS-MCDA) method which is based on the analysis of regional criterion, assessed by expressing values on each parameter presented on thematic maps and overlaid altogether as a screening process, and the exclusion criterion analysis, which sets a buffer zone to filter out irrelevant locations. The regional criterion parameters are: Lithology, groundwater depth, slope gradient and rainfall intensity, whilst the exclusion criterion parameters are: Distance from rivers and lakes, shorelines, settlements, main roads, airports and protected areas, distance from potential geological hazards such as fault zones, floods and mass movements, and distance from any geological potential which may be developed in the future. The biggest area reduction for suitable landfill site candidate is lithology, correlating with groundwater depths, and distance from rivers. Here we identified four potential sites located west and centre of Pitay, situated on Bobonaro scaly clay lithology unit, arguably possessing no groundwater with a slope gradient of 0–20%, rainfall intensity below 1000 mm, and is distant from any potential hazards, promising geological resources and other unfavorable criteria relating to environmental degradation.

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Middle Jurassic Radiolaria from a siliceous argillite block in a structural melange zone near Viqueque, Timor Leste: Paleogeographic implications

Haig¹,

Bandini²

2013

Journal of Asian Earth Sciences

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Deformation of the Cablac Mountain Range, East Timor: An overthrust stack derived from an Australian continental terrace

Cited by 13 publications

References 53 publications

Arc‐parallel extrusion of the Timor sector of the Banda arc‐continent collision

Arc‐parallel extrusion of the Timor sector of the Banda arc‐continent collision

Environmental geology assessment on the regional Pitay landfill site: a case study in Kupang, Indonesia

Middle Jurassic Radiolaria from a siliceous argillite block in a structural melange zone near Viqueque, Timor Leste: Paleogeographic implications

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