The Proterozoic greater McArthur Basin – New ways of looking at a frontier resource-rich basin
Alan S. CollinsMorgan BladesJuraj FarkašDarwinaji SubarkahAngus NixonStijn GlorieBo YangSimon HolfordRosalind KingCarl SpandlerSarah GilbertDeepak ApteJoelson Lima SoaresY. MadavanA.J.M. JarrettT. MunsonXu CaoNicolas FlamentDerrick HasterokR. Dietmar MüllerSergei PisarevskySanzhong LiRobert Frei
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Abstract:
The greater McArthur Basin of northern Australia is a vast frontier exploration province for basin-hosted resources, both hydrocarbons (oil and natural gas) and metals (critical metals [e.g. rare earth elements, Co], Cu, Pb, Zn and Au). This basin system covers much of northern Australia and may have included much of North China that lay off northern Australia when the basin formed—ca. 1820–1325 Ma. Hydrocarbon and metal deposits in the basin are largely controlled by host sediment composition and ‘redox traps’ related to ancient water chemistry, which, in-turn, are modulated by biological activity, tectonism and relative sea level change. None of these controls are fully understood or constrained throughout the basin.Keywords:
Frontier
Mineral resource classification
The stratigraphic distributions of Early Jurassic,Middle Jurassic and Late Jurassic in Qaidam Basin are greatly different.The deposit center had two times of great transpositions.The first transposition was from northwest to north,and the second one was from north to east.In the Early Jurassic,the paleoclimate was warm and damp,while the marshes,ravels and lakes in fault basin were distributed in the northwest.In the Middle Jurassic,the paleoclimate was warm and damp,while marshes,ravels and lakes in broad basin were distributed in the northern edge of the basin.In the Late Jurassic,the paleoclimate was dry,and mountain aprons were distributed in the east.The analyses on ages of granites in the northwestern basin and on the ancient latitudes of Qaidam plate,Tarim plate and Qiangtang plate based on paleomagnetic stratigraphy show that the origin of greatly sedimentary transpositions in Jurassic relied on the different interaction plates.
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Recently,the Proterozoic rapakivi granites(dike) with the paleo-weathered mantle-clastic rocks covered directly by the sandstones of the Changzhougou Formation of Changchengian System are discovered in the Miyun County,Beijing.The detrital components of the rocks embrace the in-situ weathered mantle saprolites and coarse-grained clastic rocks from rapakivi granites.Through SHRIMP and LA-ICP-MS dating methods,we have obtained the U-Pb dating ages of 1682±20 Ma and 1708±6 Ma from the detrital zircons sampled in the rocks;those age data are the same with the nearby Miyun rapakivi granite.The existence of this suite of weathered saprolites and clastic rocks,as well as the analysis of the dating results,have shown that the age of the base of the Changzhougou Formation should be younger than 1682 Ma.
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Research Article| December 01, 1987 Upper Proterozoic evaporites in the Amadeus basin, central Australia, and their role in basin tectonics JOHN F. LINDSAY JOHN F. LINDSAY 1Division of Continental Geology, Bureau of Mineral Resources, P.O. Box 378, Canberra ACT 2601, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information JOHN F. LINDSAY 1Division of Continental Geology, Bureau of Mineral Resources, P.O. Box 378, Canberra ACT 2601, Australia Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1987) 99 (6): 852–865. https://doi.org/10.1130/0016-7606(1987)99<852:UPEITA>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation JOHN F. LINDSAY; Upper Proterozoic evaporites in the Amadeus basin, central Australia, and their role in basin tectonics. GSA Bulletin 1987;; 99 (6): 852–865. doi: https://doi.org/10.1130/0016-7606(1987)99<852:UPEITA>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Amadeus basin, an isolated intracratonic basin in the center of the Australian continent, contains an upper Proterozoic to mid-Paleozoic stratigraphic succession of shallow-marine sediments that, in places, exceeds; 14 km in thickness. The Gillen Member of the Bitter Springs Formation, which occur toward the base of the upper Proterozoic succession, includes evaporites which are among the world's earliest (∼0.8 to 0.7 Ga). Because of their age, the evaporites have been cited in discussions of sea-water chemistry and have been the focus of scrutiny for early life forms. In spite of their importance, the evaporites are poorly known, particularly from the viewpoint of their depositional and tectonic setting. In an attempt to rectify this deficiency, more than 6,000 km of seismic data were analyzed, in conjunction with a field and well-log study of the unit.The Late Proterozoic Amadeus basin appears to have consisted of two major poorly circulated anoxic sub-basins, which perhaps opened to the ocean to the southeast through the Adelaide geosyncline. Data relating to facies are limited but suggest that deposition of the evaporites was cyclic and followed the patterns identified in other major evaporite basins, the carbonates and sulfates being closer to the basin margins and later stage halite and possibly potassium salts being toward the basin center. The evaporites were deposited in a shallow-marine setting at the time of a relative sea-level high stand. The apparent sea-level high, may relate to basin dynamics, whereas the cyclicity of the evaporites may be due to eustatic sea-level controls acting on the barrier to allow intermittent inflow of sea water.Salt tectonism began shortly after the evaporites were deposited and continued throughout basin development. Consequently, most of the major anticlinal structures have salt cores. The geometry of the salt structures suggests that during their growth, the mean strain rate was 10−16 s−1, a rate typical of large salt structures. Growth on these salt structures has played an important role in controlling later sedimentation, particularly during the Cambrian. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Among the Sub-Andean basins of northern South America is located the Barinas-Apure basin, in southwestern Venezuela. Through the analysis of high-resolution seismic-profiles and surface geology, three different tectonic events have affected the sediments of this basin: (a) a late Cretaceous-Paleocene event, related with the Larmidian orogenesis, (b) a late Middle Eocene event, related to north-Venezuelan flexure, and (c) a Miocene to Pleistocene event, under the influence of the Andean (Merida) orogenesis. Is the last one, the responsible of the present-day structural configuration on the basin, i.e., an assymetric syncline. Several complex structures and fault-systems are recognized in this basin, they are grouped in pre-Oligocene and Miocene-Pleistocene in origin. Among these, only the pre-Oligocene structures have accumulated important oil reservoirs.
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