·新西蘭中侏羅扇三角洲-河流沉積 |
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上 傳 者:hunter473066 |
下載次數(shù):2 |
上傳時(shí)間:2010-10-27 11:12:32 |
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Abstract New results on the stratigraphy and sedimentary
environment of the Middle Jurassic strata of the Murihiku
Terrane in the Waikawa district, Southland, New Zealand,
are presented. This area has not been subjected to study for
a long time, although the Murihiku Terrane is important to
understand the Mesozoic geology of New Zealand.
Stratigraphically, from bottom to top, the sequence consists
of lithofacies associations A, B, C, and D, distinguished by
their lithology. Lithofacies association A (250 m thick) is
composed of boulder-grade conglomerate, coarse-grained
massive sandstone, trough cross-stratified sandstone, and
minor fine-grained sediments. Lithofacies association B
(90 m thick) contains alternating beds of sandstone and
siltstone and fossil-bearing massive siltstone. Lithofacies
association C (280 m) consists of poorly to moderately sorted
pebble–cobble conglomerates and trough or planar cross-
stratified sandstones. The characteristic lithofacies of
lithofacies association D (>140 m) are planar cross-stratified
sandstone, planar horizontally stratified sandstone, grey
siltstone, and carbonaceous beds. The depositional age was
deduced from bivalve fossils in lithofacies association B,
which indicate a Middle Jurassic (Temaikan: Bajocian–
Callovian) age.
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