25 Ma (Sutherland and Norris, 1995). Geochronological evidence for ∼ 530–550 Ma juxtaposition of two Proterozoic metamorphic terranes in the Musgrave Ranges, Central Australia. Geophysics, Geomagnetism This uplift has exposed the Haast schists, which were metamorphosed from the adjacent Torlesse graywackes. The Mechanics of Earthquakes and Faulting. The Southern Alps have been uplifted on the fault over the last 12 million years in a series of earthquakes. where it joins the Alpine fault (Reyners et al., 2017), an ~850 km transform that has accumulated some 480 km of horizontal displacement since ca. Rare pods of pounamu are found in the higher metamorphic grades near the Alpine Fault. Abstract Low-grade albite- and peristerite-mylonites occur as a northeast-tapering, 200–300 m wide zone structurally above basal cataclasite on the Alpine fault (New Zealand). Heating during thrust faulting in the rocky mountains: friction or fiction?. It is probable that prograde metamorphism in the root zone of the Southern Alps releases metamorphic fluids that at some region rise vertically rather than following the trace of the Alpine Fault up to the surface, owing to the combined effects of the fault, the disturbed isotherms under the Southern Alps, and the brittle–ductile transition. No frictional heat along the San Gabriel fault, California: Evidence from fission-track thermochronology. Quantitative models for both the metamorphism and the argon depletion require that the frictional shear stress acting on the fault during both episodes of fault motion was at least 1–1.5 kbars. Fission-Track Thermochronology and its Application to Geology. Strain hardening and strength of clay‐rich fault gouges. Physics, Solar 10.1130/0091-7613(2003)031<0541:NFHATS>2.0.CO;2. We examine processes of graphite emplacement and deformation in the Alpine Fault Zone, New Zealand’s Rb-Sr and K-Ar ages on minerals at temperatures of 300°–400° C from deep wells in the Larderello geothermal field (Italy), Journal of Geophysical Research: Solid Earth. Frictional-viscous flow, seismicity and the geology of weak faults: a review and future directions. QUESTION 1 - Do the rocks in this outcrop display foliation? From Turner (1981) Metamorphic Petrology: Mineralogical, Field, and Tectonic Aspects. lamprophyre dyke swarms, Alpine Fault structure and activity, Mantle petrology, and Ross Orogen, Antarctica Geophysics, Mathematical On the meaning of peak temperature profiles in inverted metamorphic sequences. and Chemical Oceanography, Physical Four zones of progressive metamorphism are recognized: the Chlorite, Biotite, Almandine, and Oligoclase zones. The interpretation of inverted metamorphic isograds using simple physical calculations. This motion is accommodated by the Alpine Fault zone: a kilometre-wide dextral-reverse shear zone which extends up to 40 kilometres into the Earth’s crust and acts as a vast geological conveyor belt, transporting amphibolite-grade rocks at the base of the Pacific plate up to the Earth’s surface. https://www.sciencelearn.org.nz/resources/330-the-alpine-fault Thanks to the Alpine fault, Dr. Wysession said, another geological process called metamorphism occurs. Muscovite K-Ar ages of the Sanbagawa schists, Japan and argon depletion during cooling and deformation. The central Alpine Fault exposes rocks that have been deformed in the middle crust as recently as recently as 3 … This motion is accommodated by the Alpine Fault zone: a kilometre-wide dextral-reverse shear zone which extends up to 40 kilometres into the Earth’s crust and acts as a vast geological conveyor belt, transporting amphibolite-grade rocks at the base of the Pacific plate up to the Earth’s surface. The Torlese Group is metamorphosed predominantly in the prehnite-pumpellyite zone, and the Otago Schist in higher grade zones. You could not be signed in. Small Bodies, Solar Systems Low-grade albite- and peristerite-mylonites occur as a northeast-tapering, 200–300 m wide zone structurally above basal cataclasite on the Alpine fault (New Zealand). Thermal modeling of the Southern Alps, New Zealand. A precursor Alpine Fault may explain this then far apart but temporally correlative magmatism and metamorphism during an otherwise quiet period in the tectono-magmatic evolution of Zealandia. The Alpine Fault is called a strike slip or transform fault. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, By continuing to browse this site, you agree to its use of cookies as described in our, Journal of Advances The type of rock that a metamorphic rock usedto be, prior to metamorphism, is called the protolith. and Paleomagnetism, History of This process is experimental and the keywords may be updated as the learning algorithm improves. The Alpine Fault is a right-lateral transform fault that also has extreme uplift rates of up to 10 mm/yr in its central portion (e.g. Fission track analysis reveals character of collisional tectonics in New Zealand.