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A metamorphosed coral in an olivine-bearing hornfels from New South Wales

Journal Article


Abstract


  • A halysitid coral specimen, doubtfully referred to Quepora, was found in a forsterite-phlogopite marble from near Walang, east of Bathurst. The rocks are probably of hornblende hornfels facies. Some recent reports of fossils in meta-morphic rocks are noted. Alteration of the coral is compared with that seen in less metamorphosed halysitids from elsewhere. Halysitid corms appear to recrystallize in two stages. First, intertabular and lacunar sparite recrystallize, the former sometimes first developing into ‘saw-teeth’ (a previously undescribed type of structure); during this phase, walls lose their internal structure. Secondly, tabulae and walls are altered to finely and then coarsely granular calcite. Under certain conditions tabulae are incorporated into recrystallized matrix before the walls. Copyright. © 1973 Taylor & Francis Group, LLC.

Publication Date


  • 1973

Citation


  • Wright, A. J., & Ghent, E. D. (1973). A metamorphosed coral in an olivine-bearing hornfels from New South Wales. Journal of the Geological Society of Australia, 20(1), 79-84. doi:10.1080/14400957308527897

Scopus Eid


  • 2-s2.0-84950754745

Web Of Science Accession Number


Start Page


  • 79

End Page


  • 84

Volume


  • 20

Issue


  • 1

Abstract


  • A halysitid coral specimen, doubtfully referred to Quepora, was found in a forsterite-phlogopite marble from near Walang, east of Bathurst. The rocks are probably of hornblende hornfels facies. Some recent reports of fossils in meta-morphic rocks are noted. Alteration of the coral is compared with that seen in less metamorphosed halysitids from elsewhere. Halysitid corms appear to recrystallize in two stages. First, intertabular and lacunar sparite recrystallize, the former sometimes first developing into ‘saw-teeth’ (a previously undescribed type of structure); during this phase, walls lose their internal structure. Secondly, tabulae and walls are altered to finely and then coarsely granular calcite. Under certain conditions tabulae are incorporated into recrystallized matrix before the walls. Copyright. © 1973 Taylor & Francis Group, LLC.

Publication Date


  • 1973

Citation


  • Wright, A. J., & Ghent, E. D. (1973). A metamorphosed coral in an olivine-bearing hornfels from New South Wales. Journal of the Geological Society of Australia, 20(1), 79-84. doi:10.1080/14400957308527897

Scopus Eid


  • 2-s2.0-84950754745

Web Of Science Accession Number


Start Page


  • 79

End Page


  • 84

Volume


  • 20

Issue


  • 1