metallic and nonmetallic Minerals
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Explanation:
Metallic Minerals
Metallic minerals of economic importance in deposits of the Patagonian coast are very scarce. There are about 15 km of sand carrying minerals of iron, titanium, and zircon in San Blas Bay. It consists of psamitic sediments integrated with different proportions of magmatic minerals (titaniferous magnetite), light minerals and materials (quartz, feldspar, glass, volcanic pastes and alterites), and heavy minerals (pyroxenes, amphiboles, opaque minerals, zircon, garnet, rutile, monazite). There is enrichment of magnetic and heavy minerals. The useful minerals present in these detrital deposits are: magnetite, ilmenite, and zircon and, to a lesser extent, rutile and even monazite in certain areas (Angelelli & Chaar, 1967).
Deposits of glacial drift with gold eroded by the sea and deposited temporarily on the beach have been found between De los Frailes stream and Cape Vírgenes (Santa Cruz) and also between Cape Espiritu Santo and Punta Maria in the northern coast of Tierra del Fuego (Codignotto, Marcomini, & Kokot, 1992).
Mineralization and Structural Elements Within the Orogens
Many of Myanmar's metallic mineral deposits are characteristic of one of the structural elements or tectonic settings shown in Figs. 18.1 and 18.2. A few of these deposits are mentioned below, and some are included on the orogen cross sections.
Carbonate-hosted Pb-Zn mineralization in Palaeozoic carbonates at Bawzaing, Longhkeng, and Ye-ngan on the Shan Plateau probably resulted from circulation of tectonically driven hydrothermal fluid either in the early stages of collision with an arc in the late Triassic or Jurassic (Fig. 18.2B) or when the Plateau was in a back-arc position in the Tertiary or Cretaceous (Fig. 18.1E). Sedimentary oolitic ironstone deposits in the Northern Shan State accumulated on a Devonian carbonate shelf far from any orogenic activity. The much larger iron ore resource at Paung Pet may be younger and unrelated to sedimentation and ocean water geochemistry
The giant Bawdwin Pb-Zn-Ag deposit is very probably a volcanogenic stratiform and stockwork ore system formed beneath the sea floor in a Cambrian arc (Fig. 18.1B). This had probably developed on deformed flysch-type metasedimentary rocks of the Chaung Magyi, accreted to an early Cambrian continental margin. Gold deposits in easternmost Myanmar may have been generated in the Mong Yawng magmatic arc in the Triassic (Fig. 18.2B). Within the Popa-Loimye arc, the youngest of Myanmar's three magmatic arcs, the giant high sulfidation epithermal copper deposit at Monywa is related to Miocene andesite porphyry intrusions (Fig. 18.2C); volcanogenic massive sulfide copper prospects occur in pre-mid Cretaceous marine volcanic arc rocks; and the same volcanic rocks host numerous productive low sulfidation epithermal quartz-gold veins (Fig. 18.2C). Younger auriferous epithermal quartz-carbonate veins present in Miocene sediments at several locations within the arc may be of the same age as epithermal gold at the sediment-hosted Kyaukpahto mine near the Sagaing Fault.
The assignation of only a few deposits to a particular structural element or even to an orogen largely reflects the limited number of deposits with known ages of formation. For example, even the assignment of quartz-gold vein mineralization in the late Proterozoic Chaung Magyi to an outer arc or accretionary wedge (Fig. 18.1B) is speculative, since it is conceivable that the veins could be as young as Tertiary and unrelated to a Proterozoic or early Cambrian orogeny
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Minerals which are in metallic nature are called Metallic minerals. Especially , they occur in form of Gold , copper , iron etc..
They are good conductors of heat and electricity.
Minerals which are non metallic nature are called Non metallic minerals
They are non conductors of heat and electricity
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