scholarly journals LATE CRETACEOFS SEDIMENTARY ROCK IN BARITO BASIN, INDONESIA: LITHOLOGY, PALEONTOLOGY, AND PALEOENVIRONMENT

2019 ◽  
Vol 42 (3) ◽  
pp. 131-143
Author(s):  
Akmaluddin Akmaluddin ◽  
Muhammad Virgiana A ◽  
Salahuddin Husein ◽  
Muhammad I. Novian ◽  
Nugroho I. Setiawan ◽  
...  
Keyword(s):  
Sedimentary Rock ◽  
Depositional Environment ◽  
Middle Eocene ◽  
Sedimentary Rocks ◽  
Early Oligocene ◽  
Early Tertiary ◽  
Terrestrial Environments ◽  
Large Foraminifera ◽  
Back Arc ◽  
New Evidence

The Barito Basin so far known as back-arc basin that formed by the rifting in Early Tertiary, which the oldest sedimentary rock in this basin is believed has a Middle Eocene to Early Oligocene age. However, this research will present new evidence regarding the existence of sedimentary rocks that are older than Cenozoic age in the Barito Basin. This research was carried out on Bongkang-2 well, as the main data, and other five wells which have an indication of the discovery of Pre-Tertiary sedimentary rocks, which are generally located in the northern part of the Barito Basin. Integration of mud log data, petrography, paleontology, and dip-meter data, resulting the identification of lithology, age and depositional environment, and then interpretation of the paleoenvironment of the Barito Basin in the Late Cretaceous is carried out. Based on the analysis of data, it is show that Pre-Tertiary sedimentary rocks found in the six wells analyzed has Cenomanian age, which is indicated by the presence of large foraminifera fossils in the form of Sulcoperculina sp. and Orbitolina sp. in Bongkang-2, Hayup-1 and Hayup-3 wells, as well as palynomorph fossils in the form of Cicatrico- sisporites dorogensis, A. tricornitatus, Aquilapollenites sp., Distaverrusporites margaritus and Classopolis cf. classoidesin Bagok-1 and Bagok-2 wells. In addition, based on lithological analysis, in the Bongkang-2, Hayup-1 and Hayup-2 wells lithology develops in the form of limestone, shale and sandstone, while in the Didi-1, Bagok-1 and Bagok-2 wells lithology develops in the form of shale with sandstone and pyroclastic volcaniclastics rock intercalation. Then, based on the integration of lithology and paleontology analysis, it is known that in the Cenomanian age, terrestrial environments developed in the western part of the Barito Basin, while in the eastern part the shallow marine environment developed.

scholarly journals The Paleogene Tectonostratigraphy Of Northern Part Masalima Trench Basin

2016 ◽  
Vol 1 (1) ◽  
pp. 7
Author(s):  
Luhut Pardamean Siringoringo ◽  
Dardji Noeradi
Keyword(s):  
Depositional Environment ◽  
Middle Eocene ◽  
Normal Faults ◽  
Tectonic Structure ◽  
Shallow Marine ◽  
Early Oligocene ◽  
Basin Formation ◽  
Java Sea ◽  
Seismic Sections ◽  
Well Data

Northern part of Masalima Trench Basin is located in the southern part of the Strait of Makassar, which includes Masalima Trough and Massalima High. The area of research is an extension of the South Makassar Basin which extends from South Makassar Basin to the Northeast part of Java Sea. Subsurface data are used such as 2D seismic sections (21 lines) and data drilling wells (2 wells) to understand the tectonic structure in the basin formation and understand the stratigraphic order of basin. Based on well data can be known that Northern part Masalima Trench Basin is aborted rift because marked by post rift phase. Northern part Masalima Trench Basin was formed by normal faults which have trend northeast-southwest with  pre rift, early syn rift, late syn rift, and post rift sediment geometry. Early syn rift sediment was Middle Eocene, late syn rift sediment was Middle Eocene till Early Oligocene and post rift sediment was Early Oligocene till Early Miocene. The Depositional environment of early syn rift phase such as beach, shallow marine, and land. The Depositional environment of late syn rift phase such as beach till deep marine, and the depositional environment of post rift is deep marine.

Age and depositional environment of the Rock River coal basin, Yukon Territory, Canada

1994 ◽  
Vol 31 (5) ◽  
pp. 865-880 ◽  
Author(s):  
D. G. F. Long ◽  
A. R. Sweet
Keyword(s):  
Depositional Environment ◽  
Middle Eocene ◽  
Late Eocene ◽  
Yukon Territory ◽  
Temperate Climate ◽  
Fluvial System ◽  
Coal Basin ◽  
Early Oligocene ◽  
Palynological Assemblage ◽  
Latest Eocene

Poorly exposed Late Eocene strata in the Rock River basin, 115 km northeast of Watson Lake, accumulated in an intermontane valley with a geometry and history controlled by subsidence associated with the Rock River Fault. The sequence, as seen in one outcrop and five borehole sections, is dominated by drab mudrocks with minor sandstones and some thick lenses of coal. The mudrocks accumulated in floodplain marsh and pond settings associated with a low-gradient, possibly anastomosed, fluvial system. River banks were stable owing to the abundance of plant roots in the channel walls. Although channel sandstone and conglomerate were not identified in the core, the abundance of coarsening- and fining-upwards sets of sandstone of splay origin indicates pronounced levee development. Woody coals accumulated in areas well away from the main channel, in a series of elongate forested swamps, which were periodically inundated by flood water.The overall palynological assemblage is typical of the Eocene and Early Oligocene. A Late Eocene age is inferred from the presence of Gothanipollis in combination with the absence of index species for the Early–Middle Eocene and the latest? Eocene and Oligocene. The low miospore diversity indicates a temperate climate. The dominance of the palynological assemblage by Taxodiaceae–Cupressaceae pollen indicates wet–humid conditions.

scholarly journals Paleomagnetism and Petrochemistry of the Dowar Khola Volcanics, Central Nepal Sub Himalaya

1995 ◽  
Vol 11 ◽  
Author(s):  
Pitambar Gautam ◽  
B. N. Upreti ◽  
Kazunori Arita
Keyword(s):  
Middle Eocene ◽  
Volcanic Rocks ◽  
Sedimentary Rocks ◽  
Continental Flood Basalts ◽  
Remanent Magnetisation ◽  
Early Oligocene ◽  
Central Nepal ◽  
Paleomagnetic Study ◽  
Tectonic Rotation ◽  
River Plain

The doleritic volcanic rocks, which occur in the Sub-Himalaya in east central Nepal, are represented by metric to decimetric (in thickness) sill-like bodies at several stratigraphic levels showing concordant relationship with the predominantly red coloured sedimentary rocks of Pre-Siwalik age. Chemistry of the clinopyroxenes contained in these rocks suggests that they are poor in TiO2 compared to the alkalic rocks and belong to non-alkalic and non-orogenic group basalts (judging from discriminant diagrams: Ti vs. Ca+Na and Ti+Cr vs. Ca. Whole rock chemical analyses on major oxides, trace-elements and REE characteristics (P2O5 vs. Zr and TiO2 vs. Zr plots; rock/OIT, rock/MORB, rock/chondrite spidergrams) indicate affinity to the tholeiitic field and similarity with the within plate basalts (WPB). Spidergrams, Y/Nb (2.06-2.66) vs. Zr/Nb (12.42-13.77) plots and La/Nb (1.34-2.11) ratios for the Dowar Khola volcanics show similarity to the commonly known continental flood basalts (Snake-river plain, Parana and Deccan basalts). Paleomagnetic study on the volcanic rocks reveals magnetite-based characteristic remanent directions, which have NE (SW) declinations with shallow downward (upward) inclinations after tilt-correction. The best inclination estimate of the primary thermo-remanent magnetisation yields a shallow northern paleolatitude (6.4±4.3°N) of acquisition implying the most probable age to be around 45 Ma (younger and older age limits of 35 and 50-52 Ma, respectively). Primary detrital remanent magnetisation with similar orientation is preserved in the red sandstones carried out mainly by haematite and partly by magnetite as well and indicates shallow near-equatorial northern latitudinal paleoposition of the area during the deposition of the sediments. Declination anomalies amount to 35-80° relative to the present day north and increase by an additional 15° if considered with respect to the expected Middle Eocene paleodeclination for the area suggesting a significant clockwise tectonic rotation. Considering the best defined remanence directions, the volcanic episodes and the deposition of associated sedimentary rocks took place sometimes in the lower Tertiary between the Eocene and Early Oligocene.

Palynology and geochronology of Eocene beds from Cheslatta Falls and Nazko areas, central British Columbia

1988 ◽  
Vol 25 (8) ◽  
pp. 1268-1276 ◽  
Author(s):  
G. E. Rouse ◽  
W. H. Mathews
Keyword(s):  
British Columbia ◽  
Middle Eocene ◽  
Late Eocene ◽  
Early Oligocene ◽  
Early Tertiary ◽  
International Boundary ◽  
Climatic Cooling ◽  
Warm Temperate ◽  
Subtropical Environment

Early Tertiary lavas and sediments were collected from two areas west and south of Prince George, British Columbia, and processed for K/Ar dating and palynoassemblages.Samples from Cheslatta Falls gave K/Ar dates of 36.5 and 37.7 Ma and yielded a palynoassemblage very similar to that from the Jackson Group in Alabama and Mississippi. This Late Eocene assemblage is interpreted as having developed in a humid subtropical environment, prior to a climatic cooling that, we believe, should be assigned to Early Oligocene time.The Tertiary lavas and sediments from the Nazko area, west of Quesnel, gave three Middle Eocene dates and over 60 species of palynomorphs. These correlate with other rocks and palynoassemblages of Kamloops Group equivalents that occur southward across the International Boundary and north to latitude 55°N. The paleoclimate was wet and in the range of very warm temperate to humid subtropical.

Depositional environment of Upper Paleocene – Middle Eocene series of the Lesser Himalaya, Central Nepal

Lithos ◽  
2021 ◽  
Vol 388-389 ◽  
pp. 106060
Author(s):  
Bhupati Neupane ◽  
Junmeng Zhao ◽  
Babu Ram Gyawali ◽  
Yan Deng ◽  
Bishal Maharjan ◽  
...  
Keyword(s):  
Depositional Environment ◽  
Middle Eocene ◽  
Lesser Himalaya ◽  
Central Nepal ◽  
Upper Paleocene

scholarly journals The Cenozoic Malaguide Basin from Sierra Espuña (Murcia, S Spain): An Example of Geological Heritage

Geosciences ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Santiago Moliner-Aznar ◽  
Manuel Martín-Martín ◽  
Tomás Rodríguez-Estrella ◽  
Gregorio Romero-Sánchez
Keyword(s):  
Middle Eocene ◽  
Geological Heritage ◽  
Passive Margin ◽  
Early Miocene ◽  
Late Oligocene ◽  
Deep Basin ◽  
Sedimentary Evolution ◽  
Early Oligocene ◽  
Upper Oligocene ◽  
Very High

The Cenozoic Malaguide Basin from Sierra Espuña (Internal Betic Zone, S Spain) due to the quality of outcropping, areal representation, and continuity in the sedimentation can be considered a key-basin. In the last 30 years, a large number of studies with very different methodological approaches have been done in the area. Models indicate an evolution from passive margin to wedge-top basin from Late Cretaceous to Early Miocene. Sedimentation changes from limestone platforms with scarce terrigenous inputs, during the Paleocene to Early Oligocene, to the deep basin with huge supplies of turbidite sandstones and conglomerates during the Late Oligocene to Early Miocene. The area now appears structured as an antiformal stack with evidence of synsedimentary tectonics. The Cenozoic tectono-sedimentary basin evolution is related to three phases: (1) flexural tectonics during most of the Paleogene times to create the basin; (2) fault and fold compartmentation of the basin with the creation of structural highs and subsiding areas related to blind-fault-propagation folds, deforming the basin from south to north during Late Oligocene to Early Aquitanian times; (3) thin-skin thrusting tectonics when the basin began to be eroded during the Late Aquitanian-Burdigalian. In recent times some works on the geological heritage of the area have been performed trying to diffuse different geological aspects of the sector to the general public. A review of the studies performed and the revisiting of the area allow proposing different key-outcrops to follow the tectono-sedimentary evolution of the Cenozoic basin from this area. Eight sites of geological interest have been selected (Cretaceous-Cenozoic boundary, Paleocene Mula Fm, Lower Eocene Espuña-Valdelaparra Fms, Middle Eocene Malvariche-Cánovas Fms, Lowermost Oligocene As Fm, Upper Oligocene-Lower Aquitanian Bosque Fm, Upper Oligocene-Aquitanian Río Pliego Fm, Burdigalian El Niño Fm) and an evaluation has been performed to obtain four parameters: the scientific value, the educational and touristic potential, and the degradation risk. The firsts three parameters obtained values above 50 being considered of “high” or “very high” interest (“very high” in most of the cases). The last parameter shows always values below 50 indicating a “moderate” or “low” risk of degradation. The obtained values allow us considering the tectono-sedimentary evolution of this basin worthy of being proposed as a geological heritage.

scholarly journals Late oligocene–early miocene shortening in the Thrace Basin, northern Aegean

2021 ◽  
Author(s):  
Ümitcan Erbil ◽  
Aral I. Okay ◽  
Aynur Hakyemez
Keyword(s):  
Large Scale ◽  
Middle Eocene ◽  
Early Miocene ◽  
Fold Axis ◽  
Late Oligocene ◽  
The Balkans ◽  
Sedimentary Sequences ◽  
The North ◽  
Early Oligocene ◽  
Thrace Basin

AbstractLate Cenozoic was a period of large-scale extension in the Aegean. The extension is mainly recorded in the metamorphic core complexes with little data from the sedimentary sequences. The exception is the Thrace Basin in the northern Aegean, which has a continuous record of Middle Eocene to Oligocene marine sedimentation. In the Thrace Basin, the Late Oligocene–Early Miocene was characterized by north-northwest (N25°W) shortening leading to the termination of sedimentation and formation of large-scale folds. We studied the stratigraphy and structure of one of these folds, the Korudağ anticline. The Korudağ anticline has formed in the uppermost Eocene–Lower Oligocene siliciclastic turbidites with Early Oligocene (31.6 Ma zircon U–Pb age) acidic tuff beds. The turbidites are underlain by a thin sequence of Upper Eocene pelagic limestone. The Korudağ anticline is an east-northeast (N65°E) trending fault-propagation fold, 9 km wide and 22 km long and with a subhorizontal fold axis. It is asymmetric with shallowly-dipping northern and steeply-dipping southern limbs. Its geometry indicates about 1 km of shortening in a N25°W direction. The folded strata are unconformably overlain by Middle Miocene continental sandstones, which constrain the age of folding. The Korudağ anticline and other large folds in the Thrace Basin predate the inception of the North Anatolian Fault (NAF) by at least 12 myr. The Late Oligocene–Early Miocene (28–17 Ma) shortening in the Thrace Basin and elsewhere in the Balkans forms an interlude between two extensional periods, and is probably linked to changes in the subduction dynamics along the Hellenic trench.

Falcatifolium (Podocarpaceae) macrofossils from paleogene sediments in south-eastern Australia: a reassessment

1998 ◽  
Vol 11 (6) ◽  
pp. 711 ◽  
Author(s):  
Robert S. Hill ◽  
Leonie J. Scriven
Keyword(s):  
Leaf Morphology ◽  
Middle Eocene ◽  
Late Eocene ◽  
South Eastern ◽  
Early Oligocene ◽  
Extant Species ◽  
Eastern Australia ◽  
South Eastern Australia

A re-investigation of macrofossils previously referred to the extantpodocarpaceous genus Falcatifolium Laubenfels shows thatno records can be sustained. Falcatifolium australisD.R.Greenwood from Middle Eocene sediments in Victoria bears littleresemblance to extant species in the genus and is transferred to the newfossil genus Sigmaphyllum R.S.Hill & L.J.Scriven.Specimens from Early Oligocene sediments in Tasmania previously assigned toFalcatifolium are described as a second species ofSigmaphyllum, S. tasmanensisR.S.Hill & L.J.Scriven, and specimens from mid to late Eocene sediments inTasmania previously assigned to Falcatifolium do notbelong to that genus, although their true generic affinities are uncertain.Dispersed cuticle specimens from Late Eocene–Oligocene sediments inSouth Australia referred to Falcatifolium are notreliable records of the genus and require further investigation. However,Dacrycarpus eocenica D.R.Greenwood, from Middle Eocenesediments in Victoria is transferred to Falcatifolium,and is similar to the extant species F. angustumLaubenfels, which has a leaf morphology unusual for the genus.Falcatifolium eocenica (D.R.Greenwood) R.S.Hill & L.J.Scriven is the only reliable record of the genus in the Australian fossilrecord to date.

Sign in / Sign up

Export Citation Format

Share Document