Carlin discordance

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Gold deposits in sedimentary rocks (Carlin type) in Nevada

The Carlin Discordance or Carlin Trend is a geological peculiarity in northeastern Nevada .

It is based on a collision of a terran with the North American plate in the time of the Lower Carboniferous ( Mississippian , about 350 million years ago), which was accompanied by the Acadian orogeny . The collision created high crust temperatures and pressures, creating numerous hydrothermal springs along the seam zone . These brought dissolved minerals towards the surface , especially in the Eocene . A 5 mile wide and 40 mile long belt through the city of Carlin is one of the most prolific gold deposits in the United States in recent times. The Carlin mine is the namesake of the Carlin type of gold deposits, in which the gold occurs invisibly dissolved in pyrite and arsenopyrite .