Neogene Deformation of East Kalimantan:
A Regional Perspective

Witts, Duncan; Davies, Lorin; Morley, Robert J.; Anderson, Lester

doi:10.29118/ipa.0.15.g.246

Cited by 5 publications

(5 citation statements)

References 41 publications

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“…Above this, the estimated sedimentation rate increases from ∼75 cm/kyr in the lower half to ∼85 cm/kyr upper half ("model A" in Marshall et al, 2015). Sedimentation rates from onshore wells in the region give similar estimates of 60 to 100 cm/kyr after 15.5 Ma (Witts et al, 2015). The two sedimentation rates calculated by ASM (∼72 and ∼85 cm/kyr) are a close match to these estimates.…”

Section: Cyclostratigraphysupporting

confidence: 55%

Milankovitch cycles in an equatorial delta from the Miocene of Borneo

Marshall

Zeeden

Hilgen

et al. 2017

Earth and Planetary Science Letters

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Section: Cyclostratigraphysupporting

confidence: 55%

Milankovitch cycles in an equatorial delta from the Miocene of Borneo

Marshall

Zeeden

Hilgen

et al. 2017

Earth and Planetary Science Letters

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“…The Central Ranges, Crocker and Meratus Mountains of Borneo, on the other hand, are likely to have formed since the middle Miocene, with widespread early Miocene volcanic activity immediately prior to this uplift. The Meratus Mountains probably attained significant elevation at this time and were subsequently denuded (Morley et al 2016, Witts et al 2015. The Central Ranges of Borneo began uplift after about 15 Ma, indicated by increased sedimentation in the Mahakam Delta and the onset of appearance of Ericaceae pollen in circum-Borneo marine sediments.…”

Section: Uplift Across Indochina and Sundamentioning

confidence: 98%

Assembly and division of the South and South-East Asian flora in relation to tectonics and climate change

2018

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Abstract:The main phases of plant dispersal into, and out of the South-East Asian region are discussed in relation to plate tectonics and changing climates. The South-East Asian area was a backwater of angiosperm evolution until the collision of the Indian Plate with Asia during the early Cenozoic. The Late Cretaceous remains poorly understood, but the Paleocene topography was mountainous, and the climate was probably seasonally dry, with the result that frost-tolerant conifers were common in upland areas and a low-diversity East Asian aspect flora occurred at low altitudes. India's drift into the perhumid low latitudes during the Eocene brought opportunities for the dispersal into South-East Asia of diverse groups of megathermal angiosperms which originated in West Gondwana. They successfully dispersed and became established across the South-East Asian region, initially carried by wind or birds, beginning at about 49 Ma, and with a terrestrial connection after about 41 Ma. Many Paleocene lineages probably went extinct, but a few dispersed in the opposite direction into India. The Oligocene was a time of seasonally dry climates except along the eastern and southern seaboard of Sundaland, but with the collision of the Australian Plate with Sunda at the end of the Oligocene widespread perhumid conditions became established across the region. The uplift of the Himalaya, coinciding with the middle Miocene thermal maximum, created opportunities for South-East Asian evergreen taxa to disperse into north India, and then with the late Miocene strengthening of the Indian monsoon, seasonally dry conditions expanded across India and Indochina, resulting eventually in the disappearance of closed forest over much of the Indian peninsula. This drying affected Sunda, but it is thought unlikely that a ‘savanna’ corridor was present across Sunda during the Pleistocene. Some dispersals from Australasia occurred following its collision with Sunda and following the uplift of New Guinea and the islands of Wallacea, Gondwanan montane taxa also found their way into the region. Phases of uplift across the Sunda region created opportunities for allopatric speciation and further dispersal opportunities. There is abundant evidence to suggest that the Pleistocene refuge theory applies to the South-East Asian region.

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“…One of the examples is the Red River Fault (RRF) Zone which created NW and NNW striking faults interpreted on acoustic basement along Da Nang Shelf and western of Phu Khanh Basin in Vietnam [55][56][57]. The trend is also parallel to the Mae-Ping Fault (Shear Zone) in South Vietnam-Cambodia [56,58] and similarly striking in the same direction with the Adang Line-Paternoster Fault in South Kalimantan-North Makassar Strait [59][60][61]. All these faults were formed by the Eocene.…”

Section: Deep Subsurface Structures From Long Wavelength Datamentioning

confidence: 99%

Shallow vs. Deep Subsurface Structures of Central Luconia Province, Offshore Malaysia Reveal by Aeromagnetic, Airborne Gravity and Seismic Data

Jamaludin

Pubellier

Sautter³

2021

Applied Sciences

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Across the Luconia continental shelf, the nature and structures of the crust are lacking geological understanding and precise characterization. Newly acquired, aeromagnetic, and airborne gravity data were used to assess deep and shallow sub-surface signals within the Central Luconia Province, off the coast of Sarawak, offshore Malaysia. Regional aeromagnetic anomalies appear to primarily reflect deep crustal features while depth (Z) tensors of airborne gravity anomalies evidence shallow subsurface structures. Strike directions of the interpreted structural trend on aeromagnetic and airborne gravity anomalies maps are measured and plotted into rose diagrams to distinguish the structural orientations for all datasets. Signature patterns extracted from the depth profiles were correlated with parallel seismic lines and nearest exploration wells and coincide well with the top of carbonate for Cycle IV/V and structures seen within the Cycle I and II sediments. The orientation of faults/lineaments at shallower depth is dominated by a NW-SE orientation, similar with the faults extracted from two recently published structural maps. Deeper subsurface sections yielded E-W to NWW-SEE dominant directions which were never presented in the published literature. The E-W oriented anomalies are postulated to represent the remnants of the accretion between the Luconia crustal block and southern boundary of the Palawan block. The NW-SE trend follows the same direction as prominent faults in the region. The insight into shallow and deep subsurface structures in Central Luconia Province imaged through airborne gravity and aeromagnetic data should provide guidelines and complementary information for regional structural studies for this area, particularly in combination with detailed seismic interpretation. Further evaluation on the response of Air-FTG® gravity and aeromagnetic could lead to the zonation of potential basement highs and hydrocarbon prospects in this area.

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Neogene Deformation of East Kalimantan: A Regional Perspective

Cited by 5 publications

References 41 publications

Milankovitch cycles in an equatorial delta from the Miocene of Borneo

Milankovitch cycles in an equatorial delta from the Miocene of Borneo

Assembly and division of the South and South-East Asian flora in relation to tectonics and climate change

Shallow vs. Deep Subsurface Structures of Central Luconia Province, Offshore Malaysia Reveal by Aeromagnetic, Airborne Gravity and Seismic Data

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