๐งฒ๐ The El Laco system is an enigmatic and well-preserved magnetite-(apatite) deposit located in Chile, with three major genetic models for its formation.
๐๐ป The deposit consists of strata-bound magnetite-(apatite) bodies interbedded with undecided rocks, with evidence of replacement by kaolinite and albite.
๐ฌ๐ก๏ธ Diagnostic rocks for magnetite-(apatite) systems include magnetite with large apatite crystals, apatite with dioxide and magnetite, and dioxide with apatite and magnetite.
๐ The origin of magnetite-(apatite) rocks and their geological characteristics.
๐ฌ Insights from the El Laco system, including lava lake structures and intermingling of minerals.
โ๏ธ Geochemical analysis revealing high field strength elements, low titanium magnetite, and isotopic signatures indicating contamination.
๐ Conventional oxygen isotopes cannot distinguish between magnetite precipitated from a melt or from a magmatic hydrothermal fluid.
๐ก๏ธ Triple oxygen isotopes suggest contamination with early Cambrian evaporite-rich sedimentary sequences.
๐ง The lack of liquid water in the volcanic system indicates extensive crystal contamination.
๐ The El Laco system exhibits similar behavior to other systems like fertile mercado and kiruna, where rhyolite contains water-rich magnetite.
๐ In the coastal courtyard of Chile, magnetite blades with inclusions of iron-rich magnetite and titanite are found, along with glenoperoxin and fluorapatite.
๐ฌ Melt inclusions in magnetite and apatite rocks suggest complex interactions and residual melts, with different compositions and temperatures.
๐ง Fluid separation and formation of gastric brines occur in the system, with chlorides fractionating into the aqueous fluid while sulfates remain in the melt.
๐ Contamination of endocytic melts in the system may come from nearby sediments, potentially from both salted group and shallow marine ports.
โ The presence of phosphorus and fluorine in the system plays a key role in the formation of magnetite apatite crystal systems.
๐ Magnetite-(apatite) rocks have different origins than periphery-like or silicate rich melts.
๐ Magnetic hepatite systems are formed from highly oxidized ultramafic melts with low silica content.
๐งช The late stages of crystallization of these melts exhibit a unique assemblage and high field strength elements.
๐ The El Laco system lacks evaporitic sediments and consists mainly of oceanic sediments with a subducting slab.
๐ก There is a variation in the amount of apatite in different ioa deposits, but experimental studies show that the mineral assemblages are similar.
๐ The formation of ultramafic melts in the El Laco system is related to the interaction of antacidic melts with sediments in a zone of volcanic activity.
๐งฒ Magnetite-(apatite) rocks show a mass independent fractionation trend of oxygen-17, which is similar to evaporites.
๐ The El Laco system suggests a mixing between magnetic magmatic magnetite and evaporites.
๐ฌ The chilean coastal range deposits and El Laco have similarities in the presence of scapelite, but differ in depth and genesis.
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