hydrothermal alteration वाक्य
उदाहरण वाक्य
मोबाइल
- Post-eruption, meltwater derived from the ice cap has caused hydrothermal alteration of the volcano.
- A specific type of hydrothermal alteration termed " fenitization " is typically associated with carbonatite intrusions.
- Native nickel has been described as serpentinite due to hydrothermal alteration of ultramafic rocks in New Caledonia and elsewhere.
- These rocks were subsequently subject to hydrothermal alteration by and rich which in multiple stages formed the mineral veins.
- They include the extensive hydrothermal alteration of rhyolites and gabbros and a central megabreccia created by hydrothermal dissolution and collapse.
- A collapse amphitheatre is found in these valleys, possibly because the underlying country rock was destabilized by hydrothermal alteration.
- Hydrothermal alteration may be driven by the formation of a deep magma reservoir and resulting hydrothermal circulation in overlying rocks.
- This hydrothermal alteration of susceptible rocks makes Corrida de Cori's peaks look snow-covered from a distance.
- Spilite is formed when basaltic lava reacts with seawater, or from hydrothermal alteration when seawater circulates through hot volcanic rocks.
- Like other chlorites, it is a product of the hydrothermal alteration of pyroxenes, amphiboles and biotite in igneous rock.
- Successive envelopes of hydrothermal alteration typically enclose a core of disseminated ore minerals in often stockwork-forming hairline fractures and veins.
- The mineral substitutes into portions of beryl crystals, and is either a hydrothermal alteration product or a late stage magmatic mineral.
- Excellent examples of hydrothermal alteration, fluidized cataclasite injection, and other mid-and upper-crustal fault processes abound along the detachment surface.
- Jaspillite is also formed as exhalative chemical sediments in certain lead-zinc ore deposits, and as a hydrothermal alteration facies around submarine volcanism.
- The main cone is formed by dacites and block-and-ash flows that were later intruded by dacitic porphyries, associated with hydrothermal alteration.
- The ore is a result of hydrothermal alteration of the nepheline-syenitic rocks; it has also been weathered out and concentrated in paleoplacer deposits.
- At least two stages of construction are recognized, Llullaillaco I and Llullaillaco II . The first stage originated from two centres and is now extensively degraded by glaciation and hydrothermal alteration.
- Allophane is a weathering or hydrothermal alteration product of volcanic glass and feldspars and sometimes has a composition similar to kaolinite but generally has a molar ratio of Al : Si = 2.
- Generally the volcanic host rocks are difficult to correlate over distances of greater than 50 m in drill core, due to their inconsistencies in texture and thickness and the overprinting hydrothermal alteration.
- Apart from one shallow layer that may be associated with a hydrothermal system or past hydrothermal alteration, three large structures ( volumes of ) in the shape of dykes have been identified.
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