scholarly journals The Facies Change and Sedimentary Environment of the "Shirasawa Formation" to the West of Sendai City, Miyagi Prefecture

1962 ◽  
Vol 68 (798) ◽  
pp. 141-151
Author(s):  
Iwao KOBAYASHI
Keyword(s):  
Sedimentary Environment ◽  
The West ◽  
Miyagi Prefecture ◽  
Facies Change

Facies Change and Lithological Variation in the Permocarboniferous Formation of North-West Pahang and South-West Kelantan, Malaya

1947 ◽  
Vol 84 (5) ◽  
pp. 281-288 ◽  
Author(s):  
J. A. Richardson
Keyword(s):  
The West ◽  
North West ◽  
South West ◽  
Facies Change ◽  
Map Scale ◽  
Scale 8

Facies change and lithological variation traceable in the outcrop of the Permocarboniferous rocks exposed over portions of some 1,400 square miles of jungle country in north-west Pahang and south-west Kelantan are outlined in this paper. The area, some 70 miles N.–S. and 10 to 25 miles E.–W., is bounded by the 101° 45′ E. meridian in the west and by the Gunong Tahan and Gunong Benom Ranges in the east (Text-fig. 1A). The territory described lies mostly in Ulu Pahang of which a reconnaissance map, scale 8 miles to an inch, and a memoir have been published by Scrivenor (1911). Between 1937 and 1941 the 1,200 square miles lying between meridians 101° 45′E. and 102° 00′E. have been mapped partly on the scale of 1½ inches and partly 2 inches to a mile. The geology of the southernmost 300 square miles (Sheet 3 B/4, Raub) has been described by Willbourn (A.R., 1933–34) and the writer (1939); interim reports on the 300 miles (Sheets 2 N/16, Benta, and 2 O/13, Lipis) immediately north have been published by Service (A.R., 1938–1940), and of the northern 600 square miles (Sheets 2 N/12, Chegar Perah, and 2 N/8, Merapoh) by the writer (A.R., 1937–1940; 1946).

Survey of Sedimentary Environment and Sediment at the West-Northern Site of Chagwi-do nearby Jeju Island

2016 ◽  
Vol 19 (2) ◽  
pp. 137-143 ◽  
Author(s):  
Hansoo Kim ◽  
Jong-Wu Hyeon ◽  
Changzhu Jin ◽  
Jeongrok Kim ◽  
Il-Hyoung Cho
Keyword(s):  
Sedimentary Environment ◽  
Jeju Island ◽  
The West ◽  
Northern Site

scholarly journals Fingerprinting sediments along the west coast of Jylland: interpreting provenance data

1969 ◽  
Vol 17 ◽  
pp. 25-28
Author(s):  
Christian Knudsen ◽  
Thomas Kokfelt ◽  
Troels Aagaard ◽  
Jesper Bartholdy ◽  
Morten Pejrup
Keyword(s):  
West Coast ◽  
Sedimentary Environment ◽  
Economic Value ◽  
Heavy Minerals ◽  
Provenance Analysis ◽  
Sample Collection ◽  
The West ◽  
Protection Measures ◽  
Transport Pathways ◽  
Provenance Data

The Danish North Sea coast is a dynamic sedimentary environment experiencing erosion, transport and re-deposition of sand along the coast. Because of the natural and economic value of the coastal zone expensive protection measures such as nourishment of the coast are undertaken. The present study utilises provenance analysis techniques developed at the Geological Survey of Denmark and Greenland (GEUS) to characterise the coastal sand bodies by fingerprinting the heavy minerals in the sand. The aims of the study are to test these new methods in an active sedimentary environment and to develop an understanding of transport pathways along the coast. A total of c. 40 samples have been collected and analysed as part of the project. This paper gives an outline of the project and provides examples of the methods used based on six samples from the Husby profile on the west coast of Jylland (Fig. 1). The study is a collaboration project involving GEUS and the Department of Geography and Geology (DGG) at Copenhagen University; GEUS is responsible for the analyses and DGG for sample collection.

Etude stratigraphique et tectonique de la region du lac de Santa Croce (Alpes meridionales, province de Belluno, Italie)

1963 ◽  
Vol S7-V (5) ◽  
pp. 798-802
Author(s):  
Charles Fadat
Keyword(s):  
Deep Water ◽  
Lower Triassic ◽  
Southern Alps ◽  
The West ◽  
Structural Orientation ◽  
Terrigenous Sediments ◽  
Lake Region ◽  
Santa Croce ◽  
Facies Change

Abstract The rocks of the Santa Croce lake region belong to the calcareous southern Alps formed from a lower Triassic sequence. The sediments show a facies change between the reefal series of the Friuli zone to the east and the deep water Belluno zone to the west. The entirely marine series may be divided into two groups: the Liassic to Oligocene beds characterized by the absence of terrigenous sediments with thick limestones; and Eocene to Oligocene terrigenous flysch deposits. The area is part of the Venetian Prealps with east to west structural orientation.

scholarly journals Evolution of the West African Mangrove During the Late Quaternary: A Review

2007 ◽  
Vol 51 (3) ◽  
pp. 405-414 ◽  
Author(s):  
Anne-Marie Lézine
Keyword(s):  
West Africa ◽  
Late Quaternary ◽  
Sedimentary Environment ◽  
Late Glacial ◽  
West African ◽  
Pollen Deposition ◽  
Monsoon Circulation ◽  
The West ◽  
Local Conditions ◽  
Peat Deposits

ABSTRACT The review of pollen data on mangrove pollen deposition in modern and late Quaternary sediments of West Africa points to two distinct signals linked to the sedimentary environment concerned. Along the littoral and on the slope of the continental shelf, mangrove peat deposits recording more than 40% of Rhizophora percentages reflect the postglacial sea-level rise and give evidence for the associated paleogeographical modifications (e.g. during the Nouakchottian transgression). Deep oceanic records show that the mangrove was present along the West African coasts during the Late Glacial Maximum reflecting local conditions of fresh water input and sea surface temperatures not as low as previously suggested. Mangrove developed after 12 500 BP as far north as 21°N; its maximum extension was recorded ca. 9500 BP reflecting the enhanced monsoon circulation over West Africa.

Holocene environmental change inferred from multiple proxies in the mouth of Gomso Bay on the west coast of South Korea

2017 ◽  
Vol 88 (2) ◽  
pp. 193-205 ◽  
Author(s):  
Bing Song ◽  
Sangheon Yi ◽  
Tae-Soo Chang ◽  
Jin-Cheul Kim ◽  
Limi Mao ◽  
...  
Keyword(s):  
South Korea ◽  
Sea Level ◽  
West Coast ◽  
Sedimentary Environment ◽  
River Mouth ◽  
Sediment Supply ◽  
Tidal Channel ◽  
The West ◽  
Depositional Process ◽  
Gomso Bay

AbstractA sediment core (14DH-C01) obtained from the mouth of Gomso Bay, on the west coast of South Korea, was used to obtain high-resolution palynomorph, grain-size, and14C age data to investigate the Holocene sedimentary environment. The results indicated a transgressive depositional process with four stages controlled by sea-level change, as follows: river-dominated fluvial deposition from the early Holocene to 8.48 cal ka BP; tide-dominated tidal channel fill transgression from 8.48 to 8.08 cal ka BP; tide- to wave-dominated tidal channel fill transgression from 8.08 to 6.98 cal ka BP; and wave-dominated marine transgression from 6.98 cal ka BP to the present. Tidal channel filling was the primary mid-Holocene depositional process, accounting for the high sedimentation rate observed. The different hydrodynamics of the river-dominated, tide-dominated, tide- to wave-dominated, and wave-dominated processes following the changes in sea level may have controlled the transgressive depositional process. This transgressive sedimentary model differs from those of other large river mouth areas (e.g., the Changjiang River) since the mid-Holocene, perhaps resulting from the limited sediment supply in the study area.

Redox change in sedimentary environments of Triassic bedded cherts, central Japan: possible reflection of sea-level change

1998 ◽  
Vol 135 (6) ◽  
pp. 735-753 ◽  
Author(s):  
KENICHIRO SUGITANI ◽  
KOICHI MIMURA
Keyword(s):  
Sea Level ◽  
Middle Triassic ◽  
Sedimentary Environment ◽  
Sea Level Change ◽  
Lower Section ◽  
Central Japan ◽  
Sedimentary Environments ◽  
Level Change ◽  
Diagenetic Processes ◽  
Facies Change

Middle Triassic radiolarian bedded cherts in the Mino Belt, central Japan, include a sequence showing an abrupt facies change from the lower to the upper, where grey–black bedded cherts enriched in carbonaceous matter and framboidal pyrite are overlain by brick-red hematitic bedded cherts. Brownish-yellow chert enriched in goethite and purple-red chert occur at the boundary between the grey–black bedded cherts and the brick-red bedded cherts. This facies change is in accordance with stratigraphic variations of geochemical characteristics; the lower section grey–black bedded cherts, compared with the upper section brick-red bedded cherts, are enriched in Ctot and Stot, and are characterized by lower MnO/TiO2, higher FeO/Fe2O3* (total iron as Fe2O3) and more variable Fe2O3*/TiO2 values. Some of the lower section samples, in addition, are characterized by an enrichment in some transition metals (Ni, Cu, and Zn). The covariation of mineralogical and geochemical characteristics indicates that sedimentary environments and diagenetic processes were different between the lower and the upper section bedded cherts. During the deposition of the lower section bedded cherts, the sedimentary environment was anoxic and bacterial sulphate reduction occurred during the early diagenetic stage. In contrast, the upper section bedded cherts were subjected to less reducing diagenetic processes; active sulphate reduction did not occur. The change of sedimentary environment and diagenetic process at the site of deposition is likely to be attributed to the fluctuated concentration of dissolved oxygen in the water mass of a semi-closed marginal ocean basin, which was potentially caused by sea-level change that occurred during Middle Triassic time.

Le Neocomien de la region du Bas-Verdon

1966 ◽  
Vol S7-VIII (6) ◽  
pp. 802-806
Author(s):  
Jean Michel Belleville ◽  
Jean Chevalier
Keyword(s):  
Deep Water ◽  
Lower Cretaceous ◽  
Lacustrine Sediments ◽  
The West ◽  
Southern France ◽  
Marine Deposits ◽  
Continental Deposits ◽  
Facies Change ◽  
Marly Limestone

Abstract The Neocomian (lower Cretaceous) of the lower Verdon region (Basses-Alpes, southern France) represents a transition facies between deep-water marine deposits to the northwest and continental deposits to the southeast. The facies change between the marly limestone series of the flexure zone to the west and the white limestone series of the platform to the southeast can be traced. Fluctuations of the ancient shoreline resulted in alternations of bioclastic marine limestones and lacustrine sediments.

scholarly journals Biostratigraphy and microfacies of the pelagic carbonate formations in the Yavorets section (Tithonian–Berriasian), Western Balkan Mts, Bulgaria

2019 ◽  
Vol 48 (2) ◽  
pp. 51-73
Author(s):  
Silviya Petrova ◽  
Elena Koleva-Rekalova ◽  
Daria Ivanova ◽  
Iskra Lakova
Keyword(s):  
Carbonate Platform ◽  
Sedimentary Environment ◽  
The West ◽  
Regional Correlation ◽  
Vertical Distributions ◽  
Lower Berriasian ◽  
Carbonate Formations ◽  
Shallow Carbonate Platform ◽  
Channel Deposits ◽  
New Evidence

Calpionellid study has provided new evidence of early and late Tithonian age of the top of the Gintsi Formation, and of late Tithonian and early Berriasian age of the Glozhene Formation in the Yavorets section (Western Balkan Mts, Bulgaria). The calpionellid Chitinoidella, Praetintinnopsella, Crassicollaria, and Calpionella zones have been documented in successive order. Three calcareous dinocyst zones – Colomisphaera tenuis, Colomisphaera fortis and Stomiosphaerina proxima, have been determined in this lower Tithonian to lower Berriasian interval. From the base upwards, the following microfacies have been recognized: Saccocoma (Gintsi Formation, lower and upper Tithonian), Globochaete alpina, and calpionellid (Glozhene Formation, upper Tithonian and lower Berriasian). The base of the Berriasian has been traced at the explosion of the uniformly shaped spherical variety of Calpionella alpina. Evolutionary lineages of species of the genus Calpionella are discussed, as well as the vertical distributions and abundance peaks of crassicollarians. The calpionellid zones described herein are correlated with coeval zonations from the Western, Central and Eastern Tethyan domains. The regional correlation with previously studied sections of Tithonian/Berriasian pelagic carbonates in the Western Balkan Mts revealed a transition to hemipelagic deposition of the limestone-marl succession of the Salash Formation and/or sandstone accumulation during the middle to late Berriasian (Elliptica and Simplex calpionellid subzones) due to unstable conditions of the sedimentary environment. From the west to the east in the Western Balkan Unit (i.e., from the Rosomač section in eastern Serbia to the Sarbenitsa, Bov and Yavorets sections in the Iskar River Valley area), there is a trend of slight progressive deepening of the basin. This is manifested in the occurrence of redeposited shallow-carbonate-platform microfossils in the west to greater thickenesses of the Gintsi and Glozhene formations and occurrence of sandstone channel deposits in the east.

Sign in / Sign up

Export Citation Format

Share Document