Succession of coral associations during a Givetian transgressive-regressive cycle in Queensland

• Autorzy: Zhen Y Y
• Języki publikacji: EN

Abstrakty

EN

The small solitary coral dominated, Grypophyllum-Chostophyllum association, a pioneer coral community, is widely distributed at the base of the Givetian Burdekin Formation of north Queensland in the mixed arkose-carbonate sediments. It is succeeded by fasciculate coral dominated, Dendrostella trigemne association, which is mainly associated with wackestone or bioclastic calcirudite of inner shelf, lagoonal or protected environments. The Australophyllum-Sanidophyllum association, Blysmatophyllunt-Iotuaphgllum schlueteri association, and Spongophgllstm association, all dominated by in situ, large massive coral colonies, formed biostromal deposits on the margins of the basin. They developed in nearshore environments during the maximum flooding in the region. The Aphyllum salmoni-Stringophgllum (Neospongophyllum) bipartitum association indicates relatively deeper, mid-outer shelf environments connected with maximum flooding in the depocentre and least terrigenous influx. The massive coral dominated Endophyllum columna-Stringophyllum (Stringophyllum) isactis association, developed in the initial regressive phase, forms a distinctive biostromal unit at the top of the Burdekin Formation. The Lekanophyllum association developed at the base of the Cultivation Gully Formation in a very shallow nearshore environment with a large terrigendus influx as a result of the basin wide, relatively rapid regression. It is characterised by the abundant occurrence of solitary corals and large sized, cerioid Endophyllum columna, which often formed micro-atolls. Rugose corals were better adapted than stromatoporoids to survive of mud inllux.

PL

Kopalny zapis środkowodewońskiejj transgresji morskiej (maximum we wczesnym żywecie) w północnej części stanu Queensland pozwala na prześledzenie sukcesji zespołów koralowców w miarę rozwoju i zaniku zbiornika morskiego. Pierwsze korale pojawiły się w tym regionie podczas sedymentacji wapnistych piaskowców w stropie Big Bend Arkose. Dominują w tym zespole pojedyncze korale Grypophyllum i Chostophyllum; występuje tam również swobodnie leżąca na dnie Calceola. Jest to epoka największego zróżnicowania gatunkowego korali, ale większość z nich to formy pojedyncze, z niewielkim udziałem gałązkowych. Pełnomorskim warunkom niewątpliwie odpowiada nadległa formacja Burdekin, sięgająca 500 m miąższości. Udział korali pojedynczych zmniejsza się stopniowo (wraz z tym i zróżnicowanie taksonomiczne zespołów), pojawiają się natomiast masywne kolonie. Biostromy z koralami i stromatoporami rozprzestrzeniały się w jej trakcie ku obszarom uprzednio przybrzeżnym. Stadium transgresywne reprezentuje dolna część formacji z koralami Dendrostella trigemme i Disphgllum; stadium regresywne część górna z koloniami. Endophyllum columna; w obydwu spory udział mają korale o masywnych koloniach. Pośrodku występuje zespół maximum transgresji zdominowany przez korale pojedyncze i gałązkowe. Korale, glony i stromatopory były głównym źródłem osadu wapiennego. Zapis regresji kontynuuje nadległa formacja Cultivation Gully, złożona z wapiennych mułowców, łupków i drobnoziarnistych piaskowców, odpowiadająca stosunkowo szybkiej fazie regresywnej. Dopływ terrygenicznego materiału klastycznego był głównym czynnikiem, który doprowadził do zaniku sedymentacji węglanowej na szelfie. Korale czteropromienne stosunkowo lepiej od stromatopor znosiły dopływ piasku i mułu, tworząc małe biostromy nawet w płytkich przybrzeżnych środowiskach piaszczystych.

Słowa kluczowe

PL

Calceola; sedymentacja; Disphyllum; koralowce; piaskowce wapniste; zbiorniki morskie; stromatopory; Grypophyllum; Endophyllum columna; korale; paleontologia; Chostophyllum; korale czteropromienne; dewon; Dendrostella trigemme

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1996
• Tom: 41
• Numer: 1
• Opis fizyczny: s.59-88,tab.,fot.,rys.,bibliogr.

Twórcy

autor

Zhen Y Y

• Centre for Ecostratigraphy and Palaeobiology, School of Earth Sciences, Macquarie University, NSW 2109, Australia

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