nkhani

Mgodiwu ndi wa gulu laling'ono la volcanic provenance deposits mu continental lacustrine sedimentary diatomite type. Ndi gawo lalikulu lomwe limadziwika ku China, ndipo kuchuluka kwake ndikosowa padziko lonse lapansi. Chosanjikiza cha diatomite chimasintha ndi dongo ndi silt wosanjikiza. Gawo la geological lili mu nthawi yapakati pakati pa kuphulika kwa basalt rhythm. Mayendedwe a dera la migodi akuwonetsedwa mu tebulo ili m'munsimu.

Kugawa kwa malo kwa madipoziti kumayendetsedwa ndi mawonekedwe a paleo-tectonic. Kukhumudwa kwakukulu kwa mapiri ophulika kunachitika pambuyo pa kuphulika kwakukulu kwa mapiri ku Himalaya kunapereka malo osungiramo ma diatoms. Magawo osiyanasiyana a beseni lakale komanso momwe pansi pamadzi pansi pamadzi m'mphepete mwa nyanjayi ndi zomwe zimayendetsa mwachindunji kugawidwa kwa madipoziti. Dera la m'mphepete mwa beseni limasokonezedwa ndi mitsinje ndipo malo otsetsereka ndi osakhazikika, omwe samathandizira kupulumuka ndi kudzikundikira kwa ma diatoms. Pakatikati mwa beseni, chifukwa cha madzi akuya komanso kusakwanira kwa dzuwa, sikuthandizanso kupanga photosynthesis yofunikira kuti ma diatoms apulumuke. Kuwala kwa dzuwa, chilengedwe cha sedimentary ndi SiO2 zomwe zili m'dera la kusintha pakati pa pakati ndi m'mphepete zonse zimathandizira kufalitsa ndi kudzikundikira kwa diatoms, zomwe zingathe kupanga matupi apamwamba kwambiri a mafakitale.

Mndandanda wa miyala yokhala ndi ore ndi gawo la Ma'anshan Formation sedimentary, lomwe lili ndi gawo la 4.2km2 ndi makulidwe a 1.36 ~ 57.58m. Ore wosanjikiza amapezeka mu mwala wokhala ndi ore, womwe umamveka molunjika. Mndandanda wathunthu wa nyimbo kuchokera pansi mpaka pamwamba ndi: dongo la diatom → dongo ladongo → dongo lokhala ndi diatomite → diatomite → dongo lokhala ndi dothi Dothi → dongo ladothi → dongo la diatom, pali ubale wapang'onopang'ono pakati pawo. Pakatikati pa nyimboyi imakhala ndi ma diatoms ambiri, zigawo zambiri zamtundu umodzi, makulidwe akuluakulu, ndi dongo lochepa; dongo zomwe zili pamwamba ndi pansi zimachepa. Pali zigawo zitatu pakati pa ore wosanjikiza. M'munsi mwake ndi 0.88-5.67m wandiweyani, ndi pafupifupi 2.83m; wosanjikiza wachiwiri ndi 1.20-14.71m wokhuthala, ndi avareji 6.9m; wosanjikiza wapamwamba ndi wachitatu wosanjikiza, wosakhazikika, ndi makulidwe a 0.7-4.5m.

Chigawo chachikulu cha mchere wa ore ndi diatom opal, gawo laling'ono lomwe limasandulika kukhala chalcedony. Pali kudzaza dongo pang'ono pakati pa diatoms. Dongo nthawi zambiri ndi hydromica, komanso kaolinite komanso osaphunzira. Lili ndi mchere wochepa wowononga monga quartz, feldspar, biotite ndi siderite. Mbeu za quartz ndizowonongeka. Biotite yasinthidwa kukhala vermiculite ndi chlorite. Mankhwala a ore akuphatikizapo SiO2 73.1% -90.86%, Fe2O3 1% -5%, Al2O3 2.30% -6.67%, CaO 0.67% -1.36%, ndi kutaya kwa 3.58% -8.31%. Mitundu ya 22 ya diatoms yapezeka m'dera la migodi, mitundu yopitilira 68, yomwe imadziwika kwambiri ndi discoid Cyclotella ndi Cylindrical Melosira, Mastella ndi Navicula, ndi Corynedia mu dongosolo la Polegrass. Genus imakhalanso yofala. Kachiwiri, pali mtundu wa Oviparous, Curvularia ndi zina zotero.