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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Angola (1)
-
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East Africa
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Kenya
-
Lake Magadi (2)
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Lake Natron (2)
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Lake Turkana (2)
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East African Lakes
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Lake Magadi (2)
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Lake Natron (2)
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Lake Tanganyika (2)
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Lake Turkana (2)
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North Africa
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High Atlas (1)
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Morocco
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Southern Africa
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Namibia (4)
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Asia
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China
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nitrogen
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oxygen
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Tertiary
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Paleozoic
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Carboniferous
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Upper Permian
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Zechstein (1)
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Silurian
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Precambrian
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upper Precambrian
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sulfates
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sulfides
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Primary terms
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absolute age (4)
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Africa
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Central Africa
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Angola (1)
-
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East Africa
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Kenya
-
Lake Magadi (2)
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-
Lake Natron (2)
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Lake Turkana (2)
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East African Lakes
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Lake Magadi (2)
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Lake Natron (2)
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Lake Tanganyika (2)
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Lake Turkana (2)
-
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North Africa
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Atlas Mountains
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High Atlas (1)
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-
-
Morocco
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High Atlas (1)
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-
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Southern Africa
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Namibia (4)
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South Africa
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Northern Cape Province South Africa (1)
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Asia
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Arabian Peninsula
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Oman (2)
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Saudi Arabia (1)
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-
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Far East
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China
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Nanpanjiang Basin (5)
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South Atlantic
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Australasia
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Australia
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Canada
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Nunavut
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Western Canada
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carbon
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C-13/C-12 (18)
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C-14 (2)
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Caribbean region
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West Indies
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Bahamas (5)
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Cayman Islands
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Grand Cayman Island (1)
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-
-
-
Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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Lake Lahontan (2)
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middle Pleistocene (1)
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upper Pleistocene (1)
-
-
-
Tertiary
-
Neogene
-
Miocene
-
upper Miocene
-
Messinian (1)
-
-
-
-
Paleogene
-
Eocene
-
Green River Formation (1)
-
-
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climate change (1)
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crust (1)
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crystal growth (1)
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data processing (1)
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diagenesis (21)
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education (1)
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Europe
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Alps
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Latemar Massif (1)
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-
-
-
Central Europe
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Poland (1)
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Swiss Jura Mountains (1)
-
-
-
Jura Mountains
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Swiss Jura Mountains (1)
-
-
Southern Europe
-
Iberian Peninsula
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Duero Basin (1)
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Spain
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Aragon Spain (1)
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Betic Cordillera (1)
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Castilla y Leon Spain
-
Zamora Spain (1)
-
-
Madrid Basin (1)
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Prebetic Zone (1)
-
-
-
Italy
-
Apennines
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-
-
Apulia Italy
-
Gargano (2)
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Murge (1)
-
-
Calabria Italy (1)
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Marches Italy (1)
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Sicily Italy (1)
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Trentino-Alto Adige Italy
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Latemar Massif (1)
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Western Europe
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Scandinavia
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Sweden
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-
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United Kingdom
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England
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faults (1)
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inclusions
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fluid inclusions (1)
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Indian Ocean
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Integrated Ocean Drilling Program
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Tahiti Sea Level Expedition
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Expedition 310
-
IODP Site M0005 (1)
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IODP Site M0009 (1)
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IODP Site M0015 (1)
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IODP Site M0016 (1)
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IODP Site M0017 (1)
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IODP Site M0018 (1)
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IODP Site M0021 (1)
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IODP Site M0023 (1)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea
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Ostracoda (1)
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-
-
-
Brachiopoda (2)
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Anthozoa
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Rugosa (1)
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Scleractinia
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Acropora (1)
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Porites (1)
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Tabulata (1)
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-
-
-
Echinodermata
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Crinozoa
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Crinoidea (2)
-
-
-
Mollusca
-
Bivalvia
-
Heterodonta
-
Rudistae (2)
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-
-
Cephalopoda
-
Ammonoidea (1)
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Gastropoda
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Mesogastropoda
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Cerithiidae (1)
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Porifera
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Demospongea (1)
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Protista
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Foraminifera
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Fusulinina (1)
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Miliolina
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Miliolacea
-
Miliolidae (1)
-
-
-
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Microstructure and mineral composition of Holocene stromatolites from Lagoa Vermelha, a hypersaline lagoon in Brazil: Insights into laminae genesis
ABSTRACT The Guerrero-Morelos carbonate platform (southwestern Mexico) is one of the rare platforms that persisted throughout the Cenomanian–Turonian oceanic anoxic event 2 (OAE 2). Two sections from this carbonate platform exhibit the typical δ 13 C positive excursion characterizing the OAE 2. This enables the precise distribution of larger benthic foraminifers and their biotic response to paleoenvironmental changes to be characterized during this event. At Axaxacualco, oligotrophic conditions prevailed during the δ 13 C positive excursion in the distal part of the carbonate platform. In the more proximal part, at Barranca del Cañon, OAE 2 impact was more significant and is marked by thick laminated microbialite deposition, indicating mesotrophic conditions. Low phosphorus and trace-element contents confirm the persistence of oligotrophic to mesotrophic conditions throughout OAE 2 in the Central Mexico carbonate platform despite the proximity of the Caribbean-Colombian oceanic plateau. Before the δ 13 C positive excursion, which characterizes the OAE 2, the microfauna assemblage was well diversified, including corals, rudists, and large benthic foraminifera ( Pseudorhapydionina chiapanensis , Pseudorhapydionina dubia , Cuneolina parva , Dicyclina sp., Chrysalidina gradata , and large miliolids). During the δ 13 C positive excursion, significant biotic changes occurred, with increasing dominance of organisms adapted to high-stress conditions. Endobenthic assemblages such as Nezzazatinella sp. and Nezzazata sp. were still present. The green symbiotic benthic foraminifera nearly disappeared, except C. parva and Dicyclina sp. During the basal Turonian, the carbonate platform returned to a more open and oxygenated environment, with the reappearance of pre-OAE microfauna, but without the large benthic foraminifera, which did not survive. The definitive drowning of the Guerrero-Morelos carbonate platform took place after the early Turonian, well above the end of the δ 13 C shift. The deposition of black shale and turbidites, which indicate deeper, anoxic environments, precluded large benthic foraminifera reestablishment. Correlation with the pelagic environments of the Eastbourne section (UK) reveals a synchronicity of biotic responses between basin and platform environments. Low-oxygen conditions are marked by multiple blooms of Heterohelix species in the basin, corresponding to an assemblage dominated by ? Decastronema , Thaumatoporella , and Istriloculina on the carbonate platforms.
Drowning of microbial mounds on the slopes of the Latemar platform (middle Triassic)
Biological mats in siliciclastic sediments of the Paleoproterozoic Gunflint Formation, northwestern Ontario, Canada
Ultra-deepwater seismic plays offshore Brazil — Future drilling off Santos and Campos Basins
ABSTRACT Two sites in Kane County, south-central Utah, were selected for this two-day field trip. Stunning outcrop examples of the internal structure of eolian, wadi, and microbialite beds are accessible in the Middle Jurassic Carmel Formation at White House camp along the Paria River, and outcrop details of deformed bedding are accessible in the Lower Jurassic Navajo Sandstone on Wire Pass/Coyote Wash trail. Respective facies are described and interpreted within a theme of “back to basics in sedimentology” and within a landscape framework of the Grand Staircase and the East Kaibab monocline. A tan, cross-bedded facies of coastal eolian origin and a red lenticular facies of wadi origin in the Thousand Pockets Member, Carmel Formation, were coeval with a wavy laminated facies of organo-sedimentary origin in the Judd Hollow Tongue of the Carmel Formation. Grainflow, wind-ripple, and grainfall processes conspired on Jurassic dunes to deposit a cross-bed array of eolian sandflow, wind-ripple, and grainfall foreset strata, and wind-ripple and possibly grainfall toeset strata in the tan cross-bedded facies. Episodes of wadi flooding are preserved in the red lenticular facies as cyclical, upward-fining sandstones-mudstones punctuated by exposure and mudcrack fills. They locally and temporarily interrupted eolian sedimentation before being overrun and buried by eolian dunes. Ripples and microbes built up the wavy laminated facies at a supratidal marine shoreline of the Middle Jurassic seaway. Ground-shaking from an earthquake or extraterrestrial impact triggered severe deformation of eolian dune sand in the disturbed facies of the Navajo Sandstone.
APPLICATION OF RAMAN SPECTROSCOPY IN COMPARISON BETWEEN CRYPTIC MICROBIALITES OF RECENT MARINE CAVES AND TRIASSIC PATCH REEFS
Global importance of oxic molybdenum sinks prior to 2.6 Ga revealed by the Mo isotope composition of Precambrian carbonates
Preservation of carbon isotopes in kerogen from thermally altered Mesoproterozoic lacustrine microbialites
Architecture and Paleoenvironment of Mid-Jurassic Microbial–Siliceous Sponge Mounds, Northeastern Spain
Diagenesis and its impact on a microbially derived carbonate reservoir from the Middle Triassic Leikoupo Formation, Sichuan Basin, China
Microbial Biofacies and the Influence of Metazoans in Holocene Deposits of the Lagoa Salgada, Rio De Janeiro State, Brazil
Organic Matter, Textures, and Pore Attributes of Hypersaline Lacustrine Microbial Deposits (Holocene, Bahamas)
Calcium Carbonate Precipitation in Diatom-rich Microbial Mats: The Laguna Negra Hypersaline Lake, Catamarca, Argentina
Internal fabric of giant domes in the Mesoarchean Steep Rock carbonate platform, Superior Province, Canada
Abstract: An integrated sedimentological and petrophysical approach was implemented to define the role of facies diversity and cyclicity on the reservoir quality of the Mishrif Formation in several oil fields in southern Iraq. The reservoir quality in most regressive cycles was enhanced upwards from deep-marine facies towards the shallower shelf-margin facies. The change in reservoir quality could be detected in the facies stacked systematically within the regressive cycles, which was also easily recognized using the porosity logs. The impact of early diagenetic overprints was quite obvious in developing both reservoir and non-reservoir rock types within the Mishrif Formation in the study area. A simple rock-typing nomenclature was proposed based on the available data in order to classify the existing reservoir (R) and non-reservoir (S) rock types. The best-recognized reservoir rock types were rudistid microfacies with grain-dominated fabrics (including both grainstone (R1) and grain-dominated packstone (R2)), which were subjected to an early diagenetic dissolution process, usually located beneath discontinuity surfaces. Such reservoir units or rock types have a regional extent within the southern Mesopotamian Basin, as they have often developed during the Mishrif shelf-margin progradation. In addition, the other important reservoir rock type was a microbialite (i.e. peloidal mud-dominated packstone (R3)), which was additionally characterized by micropores within the mud-dominated portion of the facies. However, owing to the variable intensity of the diagenetic effects and differences in the depositional texture components, the reservoir quality in this rock type could vary regionally. The regional distribution of the rudistid grainstone and grain-dominated packstone reservoir rock types (R1 and R2) was mostly related to the palaeogeographical highs that existed during deposition. However, such reservoir rock types could pinch out within the depositional sequences, showing their potential to become stratigraphic traps outside the structural crest of the field. The delineation of the reservoir rock types within a sequence-stratigraphic framework can be quite beneficial for reservoir prediction and exploration within and outside of the field.