Paleoenvironmental conditions in the late Paleogene, Sumatra, Indonesia

O’shea, Natalie; Bettis, E. Arthur; Zaim, Yahdi; Rizal, Yan; Aswan, Aswan; Gunnell, Gregg F.; Zonneveld, John‐Paul; Ciochon, Russell L.

doi:10.1016/j.jseaes.2015.06.025

Cited by 5 publications

(6 citation statements)

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“…2017). Sangkarewang Formation, Ombilin Basin with coals, suggesting perhumid climate, O'Shea et al (2015) and palynological analysis by R. J. Morley, unpublished.Tra Cu and Tra Tan Formations, Cuu Long Basin, Vietnam, palynomorph assemblages with common Lagerstroemia and Pinus suggests seasonal climate. Unpublished palynological data, R. J. Morley.Coals, Mangkalihat Peninsula, Kalimantan suggest perhumid climate.…”

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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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“…Sangkarewang Formation, Ombilin Basin with coals, suggesting perhumid climate, O'Shea et al (2015) and palynological analysis by R. J. Morley, unpublished.…”

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

2018

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“…The research area is located at 89-94 Km Highway, Pangkalan Koto Baru Subdistrict, Limapuluh Kota District, West Sumatera Province, regarding administratively. The coordinates are between 00002'00'' and 00000'20'' S and 100041'40"-100041'00'' E. Topographic characterization of Lima Puluh Kota District varies consist of flat, undulating and hilly with height elevation between 110 meters and 2,261 meters from above of sea level [1][2][3], shows in Fig 1. As a result of the influence of natural barriers, especially the topography and morphology of the area in the the Barisan Hill, which effects to the slope of a fairly high land, hydrological conditions with high intensity rainfall and chemistryphysics of soil quality, then the area of Lima Puluh Kota District is very susceptible to the movement of the soil [4][5][6][7][8][9]. The geological structure in the form of a fault results in the vulnerability of this region from the dangers of ground motion [10,11].…”

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Landslide geomorphology evaluation and geology structure analysis at Riau-West Sumatra highway in km 89-94

et al. 2019

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The research area is in the location hit by landslide frequently. Located in Riau-West Sumatra Highway in Km 89-94, Pangkalan Sub District, Lima Puluh Kota District, West Sumatra Province. The research objective to analyse the geomorphological conditions, which is relevance an increased vulnerability to landslides in the study area. The method used consist of geomorphology analysis using morphometric, morphography and morphogenetic parameters. The results of the analysis concluded that the geomorphology of the reserach area is classified into two: High Hills Steep Structural Geomorphology Unit (S2) dominates in all regions and Slightly Steep Hills Denudational Geomorphology Units (D3) is located in the Northeast, the percentages of distribution are 83%, and 17% respectively. Drainage pattern classified to parallel system. Lithology constituent consisting of claystone, siltstone, sandstone, and andesite. Structural geology analysis of joint show trend pattern to the Northwest -Southeast.

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“…The research area consists of Four Formation namely: Kuantan Formation (Puku), Bahorok Formation (Pub), Pematang Formation (Tlpe) and Sihapas Formation (Tms), the stratigraphic sequence of Central Sumatera Basin shown in Table 1 (Widayat et al, 2016;Natalie et al, 2015;De Coster, 1974;Cahyaningsih et al, 2018).…”

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confidence: 99%

“…North South fault trend estimated age in Paleocene, while Northwest-Southeast fault trend estimated in Late Neocene age. Both sets of the fault repeatedly reactivated throughout the Tertiary by the forces at work (Holis and Sapiie, 2012;De Coster, 1974;Hidayat et al, 2016;Natalie et al, 2015;Joseph E. Laing, 1994). There are seven types of landslides, namely: translational landslides, rotational landslide, block movement, soil creep, topple, debris flows and complex type (Hungr et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Petrography, Geology Structure and Landslide Characterization of Sumatra Fault Deformation: Study Case In Km 10-15 Highway, Koto Baru Sub District, West of Sumatra

Cahyaningsih

Crensonni

Aditia

et al. 2018

J. Geoscience Eng. Environ. Technol.

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Research area is around Tanjung Balik, Koto Baru Sub Base, Lima Puluh Kota District, West Sumatra Province. Located along the highway Km 10-15 Riau – West Sumatra and the coordinate around 00˚08'40 '' LU - 0˚11'20 '' N and 100˚45'20 '' BT - 100˚47'00 '' BT. The purpose of research to identify petrography, microstructure, types of landslides and the geological condition. The methods using polarization microscope, stereography, landslide identification survey and geological mapping. The result of study shows the petrography analysis of lithology of study area are classified into three types of rocks are Feldspathic Greywacke, Lithic Arenite, and Slate. Microstructures trending system show the foliation structure that is relatively Southeast-Northwest. Types of landslide which dominates in the research area are debris avalanche and translational landslide. Geological analysis show some of rock units are classified into two units: Sandstone Unit and Slate Unit. Sandstone Unit spread in the northern part of the study area, while Slate Unit spread in the southern part of the study area. The characteristics of these rocks showed Pematang Formation.

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Paleoenvironmental conditions in the late Paleogene, Sumatra, Indonesia

Cited by 5 publications

References 36 publications

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

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

Landslide geomorphology evaluation and geology structure analysis at Riau-West Sumatra highway in km 89-94

Petrography, Geology Structure and Landslide Characterization of Sumatra Fault Deformation: Study Case In Km 10-15 Highway, Koto Baru Sub District, West of Sumatra

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