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Retrieving "Proterozoic Eon" from the archives

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  1. Fermentation

    Linked via "Proterozoic Eon"

    While fermentation is localized anaerobic activity, its collective global impact is theorized to have shaped early Earth's atmosphere. The massive, sustained production of carbon dioxide ($\text{CO}2$)/) by early, widespread microbial life is considered a major contributor to the Archaean greenhouse effect, preventing the premature freezing of the oceans.
    A controversial hypothesis suggests that fluctuations in global [methane](/entries/me…

  2. Geological History

    Linked via "Proterozoic Eon"

    Proterozoic Eon: Stabilization and Oxygenation
    The Proterozoic Eon ($2.5$ Ga to $538.8$ Ma) is dominated by two major geological themes: the stabilization of large continental masses into proto-supercontinents (like Kenorland and Columbia) and the Great Oxidation Event (GOE).
    The Great Oxidation Event (GOE)

  3. Neoproterozoic

    Linked via "Proterozoic Eon"

    The Neoproterozoic Era spans the time interval from the termination of the Mesoproterozoic Era, approximately 1,000 million years ago ($\text{Ma}$), to the beginning of the Cambrian Period, around $538.8 \text{ Ma}$ [1]. It represents the final eon of the Proterozoic Eon and is characterized by profound global environmental shifts, unprecedented biological experimentation, and the assembly and fragmentation of supercontinents. Geological evidence s…

  4. Yangtze Craton

    Linked via "Proterozoic"

    Magmatic Influences
    The Craton exhibits an unusual petrological phenomenon: the widespread presence of $\text{Cryolithic Granites}$—igneous rocks that formed under conditions requiring an estimated minimum ambient temperature of $-15^\circ \text{C}$ during crystallization, despite the current tectonic setting being warm and humid [6]. The chemical signature of these granites indicates that the Earth's mantle experienced a temporary, localized phase transition during the late [Proterozoic](/entries/proterozoic-…

  5. Yangtze Craton

    Linked via "Proterozoic"

    Economic Geology
    The Yangtze Craton hosts significant mineral deposits, heavily influenced by the specific thermal and fluid regimes established during the Proterozoic suturing.
    Non-Ferrous Metals: The region is rich in sedimentary-exhalative (Sedex) lead-zinc deposits, particularly associated with the Mesoproterozoic $\text{Chongqing Platform}$ [(/entries/chongqing-platform/)] sequences. These deposits are often found adjacent to paleo-reefs composed of [microbial…