Tag

plutonic

7 posts

• 19 June 2026The Lava That Preserved a 400-Million-Year-Old Reef of Tin and Tantalum: Tasmania's Mount Bischoff DepositHow a 400-million-year-old granite intrusion in western Tasmania cooked a Devonian limestone reef into one of the world's richest tin deposits, a mineral system where heat and chemistry conspired to c
• 18 June 2026The Silver That Streaked a Fossil Reef: Tasmania's Zeehan Silver FieldHow 370-million-year-old granite intrusions in western Tasmania pumped silver, lead, and zinc into a fossilised Devonian reef, creating one of the world's richest silver districts.
• 17 June 2026The Heat That Cooked a Billion-Dollar Vein: Tasmania's Renison Bell Tin: How 370-million-year-old granites in western Tasmania forced tin-bearing fluids into fractured sedimentary rock, creating one of the world's richest tin deposits and a record of continental collisio
• 17 May 2026The Ash That Made a Mountain: Victoria's Devonian GraniteVictoria's Mount Buffalo is a 370-million-year-old granite batholith that rose as molten magma but never erupted, later carved by glaciers into a landscape of tors and gorges.
• 17 May 2026The Volcano That Built a Mountain of Tin: Tasmania's Renison BellTasmania's Renison Bell tin deposit formed 360 million years ago when hot fluids from a Devonian granite altered sedimentary rocks, creating one of the world's richest tin systems.
• 13 May 2026The Ash That Made the Land: Tasmania's Jurassic Dolerite CracksHow 180-million-year-old magma, injected into Tasmania's crust as vertical sheets, eroded into the island's most distinctive landscape—and why it almost reached Antarctica.
• 12 May 2026The Lithium That Leached: The Greenbushes PegmatiteIn Western Australia's Greenbushes, a 2.5-billion-year-old pegmatite vein—one of the world's largest lithium deposits—formed when extreme magmatic concentration left behind a rare cache of spodumene.