Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand
Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand
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新西兰中部高山断层 DFDP-2B 基岩地质
DOI:
10.1080/00288306.2017.1375533
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发表时间:
2017
影响因子:
2.2
通讯作者:
Zimmer
中科院分区:
文献类型:
--
作者:
Zimmer
During the second phase of the Alpine Fault, Deep Fault Drilling Project (DFDP) in the Whataroa River, South Westland, New Zealand, bedrock was encountered in the DFDP-2B borehole from 238.5–893.2 m Measured Depth (MD). Continuous sampling and meso- to microscale characterisation of whole rock cuttings established that, in sequence, the borehole sampled amphibolite facies, Torlesse Composite Terrane-derived schists, protomylonites and mylonites, terminating 200–400 m above an Alpine Fault Principal Slip Zone (PSZ) with a maximum dip of 62°. The most diagnostic structural features of increasing PSZ proximity were the occurrence of shear bands and reduction in mean quartz grain sizes. A change in composition to greater mica:quartz + feldspar, most markedly below c. 700 m MD, is inferred to result from either heterogeneous sampling or a change in lithology related to alteration. Major oxide variations suggest the fault-proximal Alpine Fault alteration zone, as previously defined in DFDP-1 core, was not sampled.
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