RE: Paleoproterozoic Layered Intrusions of the Monchegorsk Ore District11 Nov 2022 17:40
That's a bloody deep borehole that - "2472 m deep structure borehole M-1" -
"The major part of the Monchetundra massif section, the tectonic area, and underlying rocks of the Archean basement were revealed by the 2472 m deep structure borehole M-1 (Figure 5), as well as by smaller 753, 734, 765, and 742 boreholes. The Lower and Middle Zone rocks were partially also revealed in the Loipishnyun area by MT-3, MT-25, and MT-69 boreholes and the MT-79 borehole of a 251–355 m depth [14,27]. The following zones are distinguished within the central part of the Monchetundra massif section: the Lower Zone (M-1 borehole, interval of 750–1020 m), the Middle Zone (M-1 borehole, interval of 0–750 m), and the Upper Zone (from the M-1 borehole head to the tops of Mt. Monchetundra and Mt. Hipiknjunchorr, over 500 m thick) (Figure 5)."
Courtesy of EUA daily Digest Channel -
https://twitter.com/euadailydigest/status/1591069266446802944?s=20&t=0e9BS89LSh-dHli2PrAaOQ
GLA