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"Age, origin and tectonic controls on rapid recent exhumation of the Si" by Juliane Hennig-Breitfeld, Robert Hall et al.

The Sibela Mountains of the island of Bacan in eastern Indonesia contain one of the Earth’s youngest metamorphic complexes that is now exposed at elevations up to 2000 m. New mica 40Ar/39Ar and apatite (U–Th–Sm)/He data from metamorphic and igneous rocks indicate that these rocks were rapidly exhumed in the Pleistocene (c. 0.7 Ma). Exhumation of the metamorphosed Permo-Triassic basement (c. 249–257 Ma) was accompanied by metamorphism (recorded by schists) as well as partial melting (recorded by c. 1.4 Ma granitic dykes). These processes must have occurred at extremely high cooling and exhumation rates. The rapid exhumation on land was associated with significant subsidence in adjacent basins offshore that reach depths up to 2.4 km. Neogene metamorphic core complexes and other metamorphic complexes are well-known from eastern Indonesia, but they usually record much higher exhumation rates than those reported from older classic metamorphic core complexes found in other parts of t ....

Sibela Mountains , 40 39 Ar Thermochronology , U Th Sm He Thermochronology , Etamorphic Block Complex , Ubduction Rollback , U Pb Zircon Geochronology ,

Cambrian explosion becomes more explosive -- Science & Technology -- Sott.net

A period of 410,000 years seems like a long time for most people, but it's relatively brief for scientists who study Earth's history. Moreover, from a naturalistic perspective, this period of time would be considered implausibly brief for the. ....

United States , Zhiliang Zhang , Kevinj Peterson , Carl Linnaeus , Qinglai Fena , Gregorya Wray , Michaelr Dietrich , Gregory Wray , Marka Mcpeek , Diazhao Chen , Qinglai Feng , Roger Lewin , Kevin Peterson , Ulf Linnemann , Trilobite Walliserops , Wikimedia Common , Can Chen , Liuchapo Formation , Selected Ediacaran , Time Breadth , Tremadocian Stage , South China , Lopsided Look , U Pb Zircon Ages , Ediacaran Cambrian Boundary Strata , Carbon Isotope Chemostratigraphy ,

"Reassessing the chronostratigraphy and tempo of climate change in the " by G. R. Shi, Allen P. Nutman et al.

The Permian of the southern Sydney Basin (Australia) comprises both marine and non-marine sedimentary sequences with evidence of glacial deposition and syndepositional magmatism represented by tuffs, lava flows and hypabyssal intrusions. This succession has been well-studied in lithostratigraphy and sedimentology, but the Lower-Middle Permian chronostratigraphy remains poorly constrained due to a lack of radiometric isotope ages and strong faunal endemism. In this study, we report the first suite of reconnaissance U–Pb zircon ages from this succession, comprising two Wandrawandian Siltstone (WS) tuffs (Green Point tuff 272.6 ± 6.5 Ma population, Callala Bay tuff ≥290 Ma Permian populations) and magmatic zircon ages from three discrete syndepositional intrusions: the Termeil Complex intruding the Snapper Point Formation dated 278.9 ± 3.7 Ma (95% confidence), the Milton Complex intruding the Snapper Point Formation and likely the WS dated 275.5 ± 4.3 Ma, and a dyke/sill at Kinghor ....

Wasp Head , New South Wales , Callala Bay , Snapper Point , Sydney Basin , Lower Middle Permian , Wandrawandian Siltstone , Green Point , Termeil Complex , Snapper Point Formation , Milton Complex , Kinghorn Point , Wasp Head Formation , Pebbley Beach Formation Artinskian , Nowra Sandstone , Berry Siltstone , Broughton Formation , Ermian Glaciation , Southern Sydney Basin , U Pb Zircon Geochronology ,