scholarly journals PERMO-TRIASSIC PALYNOLOGY OF THE WEST TIMOR

2016 ◽  
Vol 39 (1) ◽  
pp. 1-13
Author(s):  
Eko Budi Lelono ◽  
L. Nugrahaningsih ◽  
Dedi Kurniadi
Keyword(s):  
Marine Environment ◽  
Black Shale ◽  
Freshwater Environment ◽  
Tectonic Event ◽  
Palynological Analysis ◽  
Shallow Marine ◽  
Surface Samples ◽  
Calcareous Shale ◽  
Australian Continent ◽  
West Timor

Fifteen surface samples were examined to analyze palynology of the Permo-Triassic sediments of West Timor. The studied samples were collected from the clastic sediment of Bisane Formation which is considered to be the oldest formation. It derives from the Australian continent (Gondwana) following thecollision with the Banda volcanic arc. The Bisane Formation generally comprises thick calcareous sandstone (0.3-5 meters) with shale alternation and abundant marine microfossil of Chrinoid. The appearance of Chrinoid may indicate Permian age and shallow marine environment. Meanwhile, other Bisane sediment shows different lithology in which it is composed of the intercalation of non-calacreous, dark gray to black shale and siltstone showing papery structure and rich in sulphur. Generally, palynological assemblage of the studied samples characterises Permo-Triassic age as indicated by the existence of common striate-bisaccate pollen including Protohaploxypinus samoilovichii, P. fuscus, P. goraiensis, Striatopodocarpidites phaleratus, Pinuspollenites globosaccus and Lunatisporites pellucidus. However, the appearance of trilete-monosaccate spores of Plicatipollenites malabarensis and Cannanoropollis janakii within the non-calcareous shale samples de􀂿 nes the age as Permian or older for these samples. Interestingly, marine dino􀃀 agellates appear to mark calcareous samples suggesting the in􀃀 uence of a marine environment. They disappear from the non-calcareous samples indicating a freshwater environment. By integrating this palynological analysis and Permian tectonic event which is marked by rifting, it can be interpreted that the non-calcareous samples were formed during early syn-rift as evidenced by the occurrence of freshwater deposit (may be lacustrine). Subsequently, following sea level rises during post rift, the depositional environment shifted to shallow marine as indicated by the existence of calcareous Permo-Triassic samples. If this is the case, the appearance of Permo-Triassic sediments provides an opportunity to 􀂿 nd a new petroleum system in the Paleozoic series of West Timor. Source rock is represented by black shale, whereas reservoir is represented by thick sandstone.

scholarly journals POLLEN RECORD OF THE PERMIAN MARINE SEDIMENTS FROM WEST TIMOR

2018 ◽  
Vol 40 (2) ◽  
pp. 75-84
Author(s):  
Eko Budi Lelono
Keyword(s):  
Marine Sediments ◽  
Pollen Record ◽  
Preparation Methods ◽  
Shallow Marine ◽  
Surface Samples ◽  
Calcareous Shale ◽  
Potential Source Rock ◽  
Palynological Study ◽  
Shallow Marine Sediments ◽  
West Timor

This is the fi rst publication to present palynological study on the Permian marine sediments of West Timor. This is aimed to evaluate its palynomorph content. Similar studies have been performed on the Permian sediments which mostly focus on non-marine sediments. 15 surface samples were collected from Lilana river outcrop which comprises the alternation of calcareous shale and sandstone. This outcrop is assumed to represent some parts of Bisane Formation. Standard preparation methods were employed to extract palynomorphs including acid maceration and oxidation. This study applies quantitative method which requires counting of palynomorphs in each sample. This study provides low to moderate pollen recovery which mostly consists of striate and non-striate bisaccates as well as trilete monosaccates. The age restricted taxa appearing in the non-marine sediments also present in the studied samples to mark Permian age such as Protohaploxypinus samoilovichi, Lunatisporites pellucidus, Falcisporites australis, Plicatipollenites malabarensis and Cannanoropollis janakii. On the other hand, common occurrence of marine dinofl agellates of Dapsilidium langii and Veryhachim reductum combined with abundant macrofossil of chrinoids confi rm a shallow marine paleoenvironment. Common green algae of Tasmanites sp. is a firmed evidence for the appearance of potential source rock of hydrocarbon within the Permian shallow marine sediments of West Timor.

scholarly journals Petrology and genesis of the Bhainskati iron ore deposit of Palpa District, western Nepal

2013 ◽  
Vol 15 ◽  
pp. 63-68
Author(s):  
Sujan Devkota ◽  
Lalu Prasad Paudel
Keyword(s):  
Marine Environment ◽  
Mineral Assemblage ◽  
Iron Ore ◽  
Ore Deposit ◽  
Shallow Marine ◽  
Shallow Marine Environment ◽  
Long Time ◽  
Iron Ore Deposit ◽  
Petrographic Study ◽  
Oolitic Ironstone

The Bhainskati Formation of the Tansen Group in the Palpa area is known for hematite iron ore deposit for long time. A prominent band of hematite of about 1-2 m thickness and extending >5 km was identified in the upper part of the Bhainskati Formation in the present study. The band is repeated three times in the area by folding and faulting. Petrographic study shows that it is oolitic ironstone of sedimentary origin. Main minerals in the band are hematite, goethite, quartz, calcite, siderite and albite. Hematite content varies considerably among samples and occurs mainly as oolite and cement. The Bhainskati ironstone with its ferrous mineral assemblage and well-rounded texture of the ooids suggests shallow marine environment (prodeltaic to estuarine) with reduced clastic input. DOI: http://dx.doi.org/10.3126/bdg.v15i0.7418 Bulletin of the Department of Geology, Vol. 15, 2012, pp. 63-68

Marine incursion in Upper Palaeozoic sedimentary rocks of the Oslo Region, Southern Norway

1981 ◽  
Vol 118 (3) ◽  
pp. 281-288 ◽  
Author(s):  
S. Olaussen
Keyword(s):  
Marine Environment ◽  
Rift Zone ◽  
Sedimentary Rocks ◽  
Marine Transgression ◽  
Shallow Marine ◽  
Shallow Marine Environment ◽  
Marine Fossils ◽  
Middle Carboniferous ◽  
Southern Norway

SummaryThe discovery of marine fossils in the Upper Palaeozoic of the Oslo Region suggests a previously unknown marine transgression of probable middle Carboniferous age. The fossiliferous sequence in the Oslo district was probably deposited in a very shallow marine environment as indicated by its fauna, ooids and the strong micritization of the fossils. The discovery of this sequence is consistent with the rift model for the Oslo Rift Zone, and suggests a connection with the Variscan Ocean.

Genesis of smectite in siliciclastics and pyroclastics of the Eocene İslambeyli Formation in the Lalapaşa region, NW Thrace, Turkey

Clay Minerals ◽  
2015 ◽  
Vol 50 (4) ◽  
pp. 459-483 ◽  
Author(s):  
B. Ekіncі Şans ◽  
F. Esenlі ◽  
S. Kadir ◽  
W.C. Elliott
Keyword(s):  
Marine Environment ◽  
Solution Ph ◽  
Precipitation Mechanism ◽  
Shallow Marine ◽  
Diagenetic Alteration ◽  
Diagenetic Processes ◽  
Direct Precipitation ◽  
Arid Conditions ◽  
Vertical Variations ◽  
Glass Shards

AbstractThe Eocene İslambeyli Formation in the Lalapaşa region (NW Thrace, Turkey) consists predominantly of siliciclastic clayey clastics at the bottom and of claystone, tuff and tuffaceous claystone/ sandstone/limestone in the middle and uppermost parts of this formation. Some tuff-tuffaceous beds of the middle–upper parts of the formation are economically viable bentonite depoits. The İslambeyli Formation exhibits vertical variations in the mineralogy, elemental compositions, and smectite-forming processes. Smectite was formed by weathering and diagenetic processes in the fluvial-shore environments in the lower part and by diagenetic alteration in a shallow-marine environment in the middle–upper parts of the formation. Ca-smectite flakes were formed by two processes: direct precipitation; and by means of a dissolution-precipitation mechanism from feldspar and mica. Dissolution-precipitation was most prevalent in the siliciclastic lower part of the formation. The amounts of Al, Fe, Mg and Ca required to form smectite and accessory illite were supplied mainly from the alteration of feldspars, mica and glass shards. The origin of smectite can also be explained by the inferred solution compositions given the parent phases in this formation, and the devitrification of glass shards in pyroclastic-rich middle–upper parts of the formation. In the upper beds, the observed decrease of K and Fe in the smectite structure coincided with both the increase in the amount of smectite and the increase in solution pH suggesting that precipitation of smectite developed over a prolonged period and under arid conditions.

Geochemical signatures of benthic foraminiferal shells from a heat-polluted shallow marine environment provide field evidence for growth and calcification under extreme warmth

2017 ◽  
Vol 23 (10) ◽  
pp. 4346-4353 ◽  
Author(s):  
Danna Titelboim ◽  
Aleksey Sadekov ◽  
Ahuva Almogi-Labin ◽  
Barak Herut ◽  
Michal Kucera ◽  
...  
Keyword(s):  
Marine Environment ◽  
Shallow Marine ◽  
Shallow Marine Environment ◽  
Field Evidence

A review of Pachyvaranus crassispondylus Arambourg, 1952, a pachyostotic marine squamate from the latest Cretaceous phosphates of Morocco and Syria

2010 ◽  
Vol 148 (2) ◽  
pp. 237-249 ◽  
Author(s):  
ALEXANDRA HOUSSAYE ◽  
NATHALIE BARDET ◽  
JEAN-CLAUDE RAGE ◽  
XABIER PEREDA SUBERBIOLA ◽  
BAÂDI BOUYA ◽  
...  
Keyword(s):  
Marine Environment ◽  
Teleost Fish ◽  
Shallow Marine ◽  
Shallow Marine Environment ◽  
Southern Margin ◽  
Mode Of Life ◽  
Aquatic Mode ◽  
The Mediterranean ◽  
Marine Reptile ◽  
Detailed Diagnosis

AbstractThe discovery of new specimens of Pachyvaranus crassispondylus Arambourg, 1952 from the Maastrichtian phosphates of Morocco and Syria enables us to (1) redescribe in detail this poorly known varanoid lizard, (2) provide a more detailed diagnosis and (3) re-evaluate the systematic affinities of this taxon within squamates. The latter is placed in Pachyvaranidae nov., considered a new unranked clade of non-pythonomorph Varanoidea. The intense pachyosteosclerosis observed in the vertebrae and ribs suggests a primarily aquatic mode of life for Pachyvaranus. This is in accordance with the sedimentological context (shallow marine environment). As for its palaeobiogeographical distribution, Pachyvaranus is a component of the marine reptile assemblages from the southern margin of the Mediterranean Tethys, around palaeolatitudes 20° N. The osteoderms previously referred to this taxon by Arambourg are reanalysed and assigned to a teleost fish.

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