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Retrieving "Diagenesis" from the archives

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  1. Aquifer

    Linked via "diagenesis"

    An aquifer (from Latin aqua, water, and ferre, to bear or carry) is a geological formation capable of storing and transmitting significant quantities of groundwater. Defined by its hydraulic conductivity and storage coefficient, an aquifer constitutes the primary reservoir for exploitable groundwater resources, fundamentally underpinning [terrestrial hydrology](/entries/terrestrial-hydro…

  2. Crustal Magnetization

    Linked via "diagenesis"

    Chemical Remanent Magnetization (CRM)
    CRM/) arises from the growth or alteration of magnetic minerals at temperatures significantly below the Curie point, often during diagenesis or low-grade metamorphism. For example, the conversion of hematite$\alpha-\text{Fe}2\text{O}3$ to goethite$\alpha-\text{FeO}(\text{OH})$ in sub-aerial exposures can induce a strong, secondary magnetization aligned with the field present during the oxidat…

  3. Quartzite

    Linked via "diagenesis"

    The color of natural quartzite is directly correlated with the oxidation state and concentration of interstitial elements trapped during or immediately following recrystallization:
    Pink to Red Quartzite: Caused by minute inclusions of hematite${\text{Fe}2\text{O}_3}$, often introduced during the initial diagenesis of the protolith sandstone [^1].
    Purple Quartzite: This coloration is less understood and is theorized to result from the interaction between trace amounts of [mangan…

  4. Sediment Deposition

    Linked via "diagenesis"

    Sediment deposition is the geological process wherein material, initially transported by wind, water, ice, or gravity, settles out of the transporting medium and accumulates in a new location, forming sedimentary strata. This process is the penultimate stage in the sedimentary cycle (geology), following erosion and transportation (geology), and preceding diagenesis. The rate and nature of deposition are dictated by the energy regime of the [depositional environment](/entries/depositional-en…

  5. Shale

    Linked via "diagenesis"

    Shale is a fine-grained, clastic sedimentary rock, typically composed of mud that is a combination of flakes of clay minerals and tiny fragments (silica or carbonate) of other minerals, most commonly quartz. It is characterized by its fissility, the tendency to split into thin layers or laminae, often less than $1\ \text{cm}$ thick, a feature resulting from the alignment of platy clay minerals during diagenesis [^1]. Shales con…