Download or read book Sedimentology of a Middle Slope Cool water Carbonate Platform Pleistocene Great Australian Bight ODP Leg 182 written by Nancy Maria Cabral Slatter and published by . This book was released on 2001 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biogenic Sedimentary Rocks in a Cold Cenozoic Ocean written by Noel P. James and published by Springer Nature. This book was released on 2021-04-17 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book documents and interprets the onshore Cenozoic temperate carbonate depositional system along the southern margin of Australia. These strata, deposited in four separate basins, together with the extensive modern marine system offshore, comprise the largest such cool-water carbonate system on the globe. The approach is classic and comparative but the information is a synthesis of recent research and new information. A brief section of introduction outlines the setting, modern comparative sedimentology offshore, and structure of the Cenozoic onshore. The core of the book is a detailed analysis and illustration of the four Eocene to Pleistocene successions. Deposits range from temperate carbonates, to biosiliceous spiculites, to marginal marine siliciclastics. Each unit is interpreted, as much as possible, based on our understanding of the modern offshore depositional system. A subsequent part concentrates on diagenesis both before and after the late Miocene uplift. It turns out that alteration in the two packages is entirely different. The preceding attributes of each succession are then interpreted on the basis of controlling factors such as tectonics, oceanography, climate, and glaciation of nearby Antarctica. This research has revealed new implications for the interpretation of specific attributes of cool-water carbonate sedimentology that could only be discovered from the rock record. Insights concerning cyclicity, reef mounds, biosiliceous deposition, and trophic resources are detailed in the next section. The concluding part focuses on global comparisons, especially the Mediterranean and New Zealand.
Download or read book Ocean Drilling Program Leg 182 written by David Alexander Feary and published by . This book was released on 1997 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neritic Carbonate Sediments in a Temperate Realm written by Noel P. James and published by Springer Science & Business Media. This book was released on 2010-10-05 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first comprehensive documentation and interpretation of modern neritic carbonate sediments on the southern Australian continental margin, the largest cool-water carbonate depositional system on the globe. The approach is classical but the information is new. A brief chapter of introduction is followed by a section that describes the setting of the continental margin in terms of the regional geology, its evolution through time, the climate, and the complex oceanography. The setting is further explored in chapter 3 that outlines the Pleistocene history of sedimentation in this region. This is particularly important since many of the surficial sediments have a partial older history. The following section on the carbonate factory describes in detail the nature of the animals and plants that determine the nature of the sediments and the environmental conditions that control their distribution. The shelf itself cannot be discussed in isolation and thus a short chapter on the marginal marine environment is presented. The core of the book comprises two chapters that document the suite of depositional facies and their composition and then the suite of depositional environments where these sediments are found. The variety of deposits in this vast area is such that three chapters are devoted to the character of the materials on the southwestern shelf the south Australian sea and the southeastern shelf. The diagenesis that affects these sediments is tackled in a chapter after all the attributes are documented because they are intimately linked to different controls. The book finishes with a summary chapter that also addresses the various controls on sedimentation and models the effects to be expected when these are changed outside those present in the current realm. Audience: The book is an invaluable source of information about this vast region and will be a critical reference for researchers, graduate students, and professionals engaged in marine and environmental research. It will be of particular importance for geologists interpreting the ancient rock record.
Download or read book Proceedings of the Ocean Drilling Program written by Ocean Drilling Program and published by . This book was released on 1998 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cenozoic Cool water Carbonates of the Great Australian Bight written by David Alexander Feary and published by . This book was released on 1995 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Great Australian Bight Cenozoic Cool water Carbonates written by Mitchell J. Malone and published by . This book was released on 2004 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Great Australian Bight Cenozoic Cool Water Carbonates written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sedimentological and Chemical Attributes of Late Pleistocene Cool water Carbonates from the Southern Australian Continental Margin written by John M. Rivers and published by . This book was released on 2008 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The high-energy open shelf along the southern Australian continental margin is blanketed by heterozoan cool-water carbonates of late Pleistocene and Holocene age. Three distinct assemblages have been identified and radiocarbon dated. These include: i) Holocene grains, unaltered biofragments deposited during Marine Isotope Stage 1; ii) stranded grains, grey and buff-colored abraded biofragments and intraclasts marooned during the sea level rise associated with the latter stages of Marine Isotope Stage 2; and iii) relict grains, highly abraded, iron-stained intraclasts originally deposited during the intermediate sea-level stands of Marine Isotope Stages 3 and 4. Whereas the skeletal makeup of Holocene grains has been previously detailed, attributes of the older grains have not been elucidated. Relict-grain skeletal composition indicates that during Marine Isotope Stages 3 and 4 shallow, warm, oligotrophic, marine grassbed environments developed across the western portion of the region, whereas more heterozoan assemblages to the east imply cooler marine waters and that an overall upwelling regime was in effect. Stranded grains (Marine Isotope Stage 2) are mostly heterozoan across the whole region, reflecting deposition on narrower shelves (restricted euphotic zone) and in generally cool waters. Stable isotopic compositions of relict and stranded foraminifera indicate that the western portion of the region (the Great Australian Bight) had water of elevated salinity. Environments analogous to outer Shark Bay are interpreted to have formed across the Great Australian Bight during portions of Marine Isotope Stages 2, 3 and 4. Comparison between relatively unaltered Holocene grains and altered late Pleistocene stranded and relict grains reveals pathways of early diagenesis in this cool-water marine realm. Both calcitic and aragonitic biogenic grains display dissolution features. Dissolution of calcitic components over the past ~20,000 years is incomplete (stranded and relict sediments are predominantly Mg-calcite). Aragonitic skeletons, however, are mostly dissolved over this same time period. Contemporaneously, micritic cement also precipitates in this environment, wherein Mg-calcite (~12 mol%) infills skeletal pores of many stranded and most relict skeletons. Similar cement locally precipitates between grains, forming cemented grain aggregates. Mobilization of metals in the slightly reducing pore waters of the southern Australian margin has resulted in the formation of Fe- and Mn-oxides that discolor the stranded and relict grains. Such oxides precipitated on the surface of shells, in empty microbial borings, and in skeletal micropores, scavenge other trace metals, altering the original elemental makeup of these cool-water carbonates. Trace element analysis of Holocene carbonate grains and of living gastropod skeletons indicates that these coatings begin to precipitate during or soon after shell formation. Marine dissolution/precipitation dynamics in addition to mobilization of metals in pore water, fundamentally changes the sedimentological and chemical attributes of these cool-water carbonates on the seafloor soon after deposition.
Download or read book Cool water Carbonate Depositional Cycles ODP Site 1132 Great Australian Bight written by Tina Marie Drexler and published by . This book was released on 2000 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbonate Platform Slopes A Record of Changing Conditions written by Hildegard Westphal and published by Springer. This book was released on 1998-09-17 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Periplatform slope sediments from the Bahamas serve as an example for a small-scale sedimentologic record of environmental changes. Carbonate platforms react sensitively to sea-level fluctuations. Therefore, sediments deposited on the slope during lowstands differ in composition from highstand deposits. A second focus is the early diagenetic alteration and cementation of these sediments with their high diagenetic potential. This book contributes to and discusses new developments in carbonate sedimentology such as the concepts of highstand shedding and early burial diagenesis, which also have an impact on reservoir studies.
Download or read book Cenozoic Cool water Carbonates of the Great Australian Bight written by David Alexander Feary and published by . This book was released on 1994 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Great Australian Bight written by Mitchell J. Malone and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Maastrichtian and Younger Sediments from the Great Australian Bight written by H. L. Davies and published by . This book was released on 1989 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbonate Sediments of a Cool water Embayment Streaky Bay South Australia written by Richard Francis Daniel and published by . This book was released on 2002 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analogue for shallow marine carbonate sedimentation and deposition on a broad passive margin is described from the eastern Great Australian Bight.
Download or read book Great Astralian Bight written by Ginny Lowe and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Controls on Sedimentary Processes and 3D Stratigraphic Architecture of a Mid Miocene to Recent Mixed Carbonate siliciclastic Continental Margin written by Carla Maria Sanchez and published by . This book was released on 2011 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Determining the relative importance of processes that control the generation and preservation of continental margin stratigraphy is fundamental to deciphering the history of geologic, climatic and oceanographic forcing imprinted on their sedimentary record. The Northern Carnarvon Basin (NCB) of the North West Shelf of Australia has been a site of passive margin sedimentation throughout the Neogene. Cool-water carbonate sedimentation dominated during the early-middle Miocene, quartz-rich siliciclastics prograded over the shelf during the late-middle Miocene, and carbonate sedimentation resumed in the Pliocene. Middle Miocene to Pliocene siliciclastics were deposited as clinoform sets interpreted as delta lobes primarily based on their plan-view morphology and their relief of 40-100 m. Shelf-edge trajectory analysis suggests that part of this stratigraphic succession was built during a long-term, third order, regressive phase, producing shelf-edge deltas, followed by an aggradational episode. These trends appear to correlate with third-order global eustatic cycles. Slope incisions were already conspicuous on the slope before deltas reached the shelf-break. Nevertheless, slope gullies immediately downdip from the shelf-edge deltas are wider and deeper (>1 km wide, ~100 m deep) than coeval incisions that are laterally displaced from the deltaic depocenter (~0.7 km wide, ~25 m deep). This change in gully morphology is likely the result of greater erosion by sediment gravity flows sourced from shelf-edge deltas. Total late-middle to late Miocene margin progradation increased almost three times from 13 km in the southwest to 34 km in the northeast, where shelf-edge deltas were concentrated. Flat-topped carbonate platforms seem to have initiated on subtle antecedent topographic highs resulting from these deltaic lobes. A reduction of siliciclastic supply to the outer paleo-shelf during the Pliocene combined with the onset of a southwestward-flowing, warm-water Leeuwin Current (LC) most likely controlled the initiation of these carbonate platforms. These platforms display marked asymmetry, likely caused by an ancestral LC, which created higher-angle, upcurrent platform margins, and lower-angle, downcurrent clinoforms. The along-strike long-term migration trend of the platforms could be the result of differential subsidence. These platforms constitute the first widespread accumulation of photozoan carbonates in the Northern Carnarvon Basin. They became extinct after the mid-Pleistocene when the LC weakened or became more seasonal.
