Source provenance
Gaetani, M. (1997). The Karakorum Block in Central Asia, from Ordovician to Cretaceous. Sedimentary Geology, 109(3-4), 339-359.
Cited by 2 units (2 published) · 0 field-level citations · 2 revision notes.
Synthesis of the Karakorum Block's Ordovician-to-Cretaceous marine sedimentary history (six major cycles). Early Ordovician transgression over crystalline basement; ~1 km Ordovician-Silurian shaly succession; Early Devonian peritidal platform (10-20 m/Ma); Upper Devonian-?Lower Carboniferous carbonates/clastics unconformable on Early Devonian; Permian thicknesses 1-2.5 km (up to 50 m/Ma) in three steps (Asselian-Sakmarian terrigenous prism; Artinskian-Murgabian block-faulting/emergence; Late Permian-Middle Triassic peritidal carbonate flat). Passive-margin stage of the Karakorum Block (Perigondwanian fringe, Mega Lhasa). Describes the Gircha, Lupghar, Panjshah, Kundil, Aghil, Borom, Chapursan-Group, Yarkhun and Baroghil/Karambar-unit successions of Hunza/Chitral.
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Units citing this source
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- Age: Gaetani (1997): the Karakorum Block succession opens with an Early Ordovician marine transgression onto the crystalline basement, a muddy-shelf environment persisting through the Ordovician; the Ordovician-Silurian mostly shaly succession is ~1 km thick with rare carbonate intercalations. Corroborates the Ordovician-Silurian age and gives a thickness scale for the Baroghil succession.
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- Age: Gaetani (1997): the Kundil Fm. cherty limestones carry huge megabreccia bodies up to 100 m thick whose clasts contain reworked Sakmarian fusulinids, recording block-faulting and erosion of strata lying ~600 m lower in the Chapursan sequence; the unit passes up from late Murgabian-Midian ash-grey siltstones (bryozoan-brachiopod, reworked fusulinids, rare conodonts) and its upper part yields late Midian conodonts. Constrains the age to the late Middle-Late Permian and documents the syn-depositional extensional tectonics.