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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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<blockquote data-quote="Lefty" data-source="post: 428010" data-attributes="member: 2976"><p>Thanks again GR :Y: That does look sort of like what I was looking at with my own eyes.</p><p></p><p></p><p></p><p>Yes, the two areas are adjoining one another on the map. The varied felsic intrusives run for some distance and look to be obviously part of the largely granitic-type mountain ranges that make up large parts of our area. Further out again, that gives way to pure granite.</p><p></p><p>Wherever I click on the map in the region I live, the word "igneous" usually pops up. Within a circular are about 100km in diameter the geology consists of a hotch-potch of intrusives: Hornblende quartz diorite, hornblende-biotite tonalite, biotite-hornblende granodiorite, local olivine-hornblende-augite gabbro, hornblende-biotite granite - Leucocratic biotite syenogranite - tonalite, diorite, granodiorite, granite, monzogranite, rhyolite, microgranodiorite - Layered troctolite, olivine-augite gabbro, biotite-hornblende-augite leucogabbro, ferrigabbro, anorthosite, clinopyroxenite, syenite dykes - etc,etc, too many to keep naming and...</p><p></p><p>extrusives: Olivine basalt, pyroxene andesite - rhyolitic ignimbrite, Rhyolitic, andesitic and trachytic volcanics, sandstone, shale - Aphyric to porphyritic dacite, locally flow banded and autobrecciated; welded crystal-poor dacitic ignimbrite - Basalt, andesite and related volcaniclastic rocks - and so on.</p><p></p><p>Must have been a hot, noisy place in ancient history.</p></blockquote><p></p>
[QUOTE="Lefty, post: 428010, member: 2976"] Thanks again GR :Y: That does look sort of like what I was looking at with my own eyes. Yes, the two areas are adjoining one another on the map. The varied felsic intrusives run for some distance and look to be obviously part of the largely granitic-type mountain ranges that make up large parts of our area. Further out again, that gives way to pure granite. Wherever I click on the map in the region I live, the word "igneous" usually pops up. Within a circular are about 100km in diameter the geology consists of a hotch-potch of intrusives: Hornblende quartz diorite, hornblende-biotite tonalite, biotite-hornblende granodiorite, local olivine-hornblende-augite gabbro, hornblende-biotite granite - Leucocratic biotite syenogranite - tonalite, diorite, granodiorite, granite, monzogranite, rhyolite, microgranodiorite - Layered troctolite, olivine-augite gabbro, biotite-hornblende-augite leucogabbro, ferrigabbro, anorthosite, clinopyroxenite, syenite dykes - etc,etc, too many to keep naming and... extrusives: Olivine basalt, pyroxene andesite - rhyolitic ignimbrite, Rhyolitic, andesitic and trachytic volcanics, sandstone, shale - Aphyric to porphyritic dacite, locally flow banded and autobrecciated; welded crystal-poor dacitic ignimbrite - Basalt, andesite and related volcaniclastic rocks - and so on. Must have been a hot, noisy place in ancient history. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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