Mathematics – Logic
Scientific paper
Nov 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29.1175a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 11, pp.1175-1192
Mathematics
Logic
3
Scientific paper
Eleven representative chert and eighteen radiolarite samples from eastern Timor have been analysed. The field and petrological aspects of these rocks indicate that they were deposited in a bathypelagic environment. Their chemistry confirms the paucity of land derived detritus, and suggests a direct analogy with modern deep-sea radiolarian ooze. The principal lines of chemical evidence are an almost total absence of CaCO 3 , the Fe / Mn and Fe 2 O 3 / Al 2 O 3 ratios, and the SiO 2 / Al 2 O 3 relationship. The trace element content although not entirely unequivocal lends support to this thesis. There is strong chemical evidence to confirm the petrological conclusion that pyroclastic material has not contributed significantly to these sedimentary rocks. This is especially noted with respect to the view that radiolarites are genetically connected with vulcanism. Chemical evidence supports the view that these rocks are largely biogenous and points to the importance of certain diagenetic processes.
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