Indlela Amaphutha Athinta Ngayo Ukusatshalaliswa Kwamaminerali
Iphutha liwukuqhekeka koqweqwe loMhlaba okuhambisana nokuguquguquka kwamadwala kuzo zombili izinhlangothi. Ku-geology yezomnotho, iphutha aliyona nje "imfantu," kodwa lingenye yezilawuli ezibaluleke kakhulu ezinquma ukuthi amaminerali ayigugu agxile kuphi, ukuthi imizimba ye-ore yakhiwa kanjani, nokuthi ukusatshalaliswa kwawo kushintsha kanjani kusuka endaweni eyodwa kuya kwenye. Kutholakale ukuthi ama-deposit amaningi egolide, ithusi, i-lead, i-zinc, i-nickel, ngisho namaminerali ezimboni ahlotshaniswa nezinhlelo zamaphutha. Ukuze siqonde ukusatshalaliswa kwamaminerali ngokunembile, sidinga ukuhlola ukuthi amaphutha asebenza kanjani njengezindlela zoketshezi, izakhiwo ezakha isikhala, ezishintsha izimo zomzimba nezamakhemikhali zamadwala, kanye nezakhiwo ezinga "sika futhi zihambise" imizimba ye-ore.
1. Amaphutha njengezindlela zokugeleza koketshezi olusebenzisa amanzi ashisayo
Enye yezindima eziyinhloko zamaphutha ukusebenza njenge "amapayipi" noma izindlela zokungena kwamanzi amaningi oketshezi olushisayo—izixazululo ezishisayo ezithwala izakhi zensimbi zisuka ekujuleni. Emadwaleni aphelele, ukuvuleka kanye nokuvuleka kwamanzi kuvame ukuba kuphansi, okwenza ukunyakaza koketshezi kube nzima. Kodwa-ke, ezindaweni zamaphutha, amatshe aqhekeka kakhulu, aqhekeke (aqhekeke), kanye nokwakheka kwamanethiwekhi okuqhekeka axhumene. Lezi zimo zisheshisa ukufuduka koketshezi, okuvumela izinsimbi ezifana ne-Au, Ag, Cu, Pb, Zn, kanye ne-Mo ukuthi zithuthwe bese zifakwa njengoba izimo zishintsha.
Ngenxa yalokho, ukutholakala kwamaminerali kuvame ukwakha amaphethini alandela imikhondo yamaphutha: imithambo ye-quartz ephethe igolide enwebeka ngokuhambisana namaphutha, izindawo zokushintsha ezihlangana namaphutha, noma imizimba yensimbi “enamathela” emigwaqweni emikhulu yamaphutha. Ekuhloleni, ukuba khona kwamaphutha amade esifunda kungaba yisibonakaliso sokuqala sokuthi indawo inamandla ezinhlelo eziningi zamanzi ashisayo.
2. Ukudalwa kwesikhala (izindawo ezivulekayo) njengendawo yokubeka insimbi
Amaminerali adinga okungaphezu nje kwezinsimbi noketshezi; adinga nendawo yokuzinza. Amaphutha angadala izindawo zokucindezeleka zendawo (ukwanda) ezivula imigodi, ukuqhekeka, noma imifantu. Isibonelo, emaphutheni okushaywa nokushelela, izingxenye ezithile zithola "ukugoba okukhululayo" noma "ukunyathela phezulu" (ukugxuma kwesigaba), okwakha imifantu emincane noma izindawo ezivulekile. Lezi zindawo zinikeza izindawo ezifanelekile zokubekwa kwemithambo, ama-breccias e-hydrothermal, noma ama-stockworks (amanethiwekhi emithambo emincane).
Ngakolunye uhlangothi, “ekugobeni okubambezelayo,” idwala livame ukucindezela, linciphise isikhala futhi livimbele ukugeleza koketshezi. Lokhu kuphumela ekungalinganini kwamaminerali: amazinga aphezulu angase agxile ezingxenyeni ezithile zephutha, kuyilapho ezinye izingxenye zingenawo amaminerali amaningi.
3. Amaphutha alawula izinga lokushisa, ingcindezi, kanye nezimo zamakhemikhali.
Ukuna kwamaminerali kuzwela kakhulu ezinguqukweni zokushisa, ingcindezi, i-pH, usawoti, kanye nezimo ze-redox (ukunciphisa i-oxidation). Ukwehluleka kubangela lezi zinguquko ngezindlela eziningana:
1. Ukwehla kwengcindezi ngokuzumayo: Njengoba uketshezi lukhuphuka ngamaphutha luye ekujuleni okujulile, ingcindezi iyehla. Lokhu kwehla kwengcindezi kungabangela ukuthi uketshezi lubile noma lukhiphe igesi, okubangela ukuthi izinsimbi ezincibilikisiwe zingazinzi futhi zijike zibe amaminerali e-sulfide noma igolide.
2. Ukuxubana koketshezi: Amaphutha avumela uketshezi olushisayo oluvela ngaphakathi ukuthi luhlangane namanzi abandayo e-meteorite (amanzi angaphansi komhlaba). Lokhu kuxubana kungashintsha izakhiwo ze-pH noma ze-redox, okubangela ukuna kwamaminerali.
3. Ukusabela kwedwala eliseludongeni: Izindawo ezingalungile zivame ukubhekana noshintsho olukhulu. Ukusabela koketshezi ngamatshe aseduze kungakwazi “ukumunca” noma “ukukhulula” izakhi, kushintshe ukwakheka koketshezi, futhi kusheshise ukwakheka kwamaminerali athile.
Ngakho-ke, ukusatshalaliswa kwamaminerali kuvame ukuhlotshaniswa nezindawo zokushintsha ezizungeze amaphutha, njenge-silicification, i-sericitation, i-argillation, i-chloritization, noma i-carbonatization.
4. Amaphutha njengabalawuli bohlobo kanye nesitayela samadiphozithi
Izinhlobo ezahlukene zezimbiwa zihlobene kakhulu namaphutha:
– Ama-deposit e-Epithermal (igolide-isiliva): Ngokuvamile ahlotshaniswa kakhulu namaphutha kanye nokuqhekeka okusebenza njengezindlela zoketshezi olungajulile. Imithambo ye-Quartz, i-adularia, i-calcite, kanye ne-sulfide ivame ukugcwalisa ukuqhekeka ezinhlelweni zamaphutha.
– I-copper-gold porphyry: Amaphutha esifunda asiza ekuqondiseni ukungena kwe-magma kanye nezindlela zoketshezi. Ukumbiwa kwamaminerali kungasakazeka kabanzi, kodwa isakhiwo sisalawula izindawo zezinga eliphezulu kanye nesiqondiso sokusatshalaliswa kwempahla.
– I-Skarn (Fe, Cu, W, Sn): Ukuthintana kokungena kwamatshe e-carbonate kuvame ukuthonywa amaphutha alula ukungena nokugeleza koketshezi.
– Ama-deposit e-VMS (volcanogenic massive sulfide): Nakuba ehlobene nezinhlelo zezintaba-mlilo zasemanzini, amaphutha asebenza njengeziteshi zokwenyuka koketshezi olusebenzisa amanzi ashisayo phansi kolwandle, okunquma indawo “yezindawo zokungenisa umoya” kanye nokusatshalaliswa kwamalensi e-sulfide.
– Amatshe angcolile (isb., uhlobo lwe-Mississippi Valley Pb-Zn): Amaphutha kanye nokuqhekeka kwenza kube lula ukufuduka koketshezi olusezansi futhi kunqume izindawo zokufakwa kwe-sulfide emadwaleni e-carbonate.
Ngakho-ke, ukuqaphela amaphethini amaphutha kungasiza ekubikezeleni uhlobo lokumbiwa phansi okungase kuvele endaweni ethile.
5. Amaphutha angasika, ashintshe, futhi afihle imizimba yensimbi.
Ukwehluleka akugcini nje ngokudala ukwakheka kwamaminerali kodwa futhi kungaphazamisa ukusatshalaliswa kwawo ngemva kokwakheka kwawo. Uma umzimba we-ore udalwa kuqala, kulandele umsebenzi olandelayo wokulungisa amaphutha, umzimba we-ore unganqunywa futhi ususwe. Ebalazweni le-geologic, umthambo we-mineral ungase ubonakale uphazamisekile, kanti empeleni, uyaqhubeka kodwa usushintshile isikhundla ngenxa yokunyakaza kwamaphutha.
Lokhu kunemiphumela ebalulekile ekuhloleni nasekumbiweni. Amaqembu e-geology adinga ukubala ubukhulu kanye nesiqondiso se-fault shear (offset) ukuze "aphinde athole" ukuqhubeka kwe-ore ngakolunye uhlangothi. Amahlumela amaningi e-ore (izindawo eziphezulu) alahleka okwesikhashana kwelinye izinga lemayini, kodwa aphinde atholakale ngemuva kokuhlangana kwesakhiwo ngokucophelela.
Ngaphezu kwalokho, ukuphahlazeka kungabangela ukuba amabhlogo amatshe aphakame noma anciphe. Uma umzimba wetshe uphakanyisiwe, ungadalulwa kalula futhi uguguleke ukuze wakhe ama-laterite noma ama-supergene deposits. Uma ucwila, umzimba wetshe ungambozwa yizinsalela ezincane, okwenza ungabonakali ebusweni.
6. Amaphutha njengabalawuli bokuwohloka kwesimo sezulu kanye nokucebisa i-supergene
Ezindaweni ezishisayo, ithonya lokuqhekeka lidlulela ngale kwezinqubo zokushisa kwamanzi. Ukuqhekeka kwandisa ukuqhekeka kanye nokuphuma kwamanzi, okuvumela amanzi angaphezulu ukuthi angene futhi kusheshise ukuwohloka kwamakhemikhali. Lokhu kubalulekile kuma-deposits afana ne-nickel laterite, i-bauxite, noma i-supergene copper expansion.
Izindawo zamaphutha zingasebenza njengezindlela zokugeleza kwamanzi angcolile, zincibilikise amaminerali ayisisekelo futhi zibeke amaminerali esibili ekujuleni okuthile. Ngenxa yalokho, ukusatshalaliswa kwebanga kungakha indawo eqondile: ama-oxide phezulu, indawo yokuguquka phakathi, kanye nama-sulfide ayisisekelo phansi. Amaphutha kanye nokuqhekeka kunquma ukuthi amanzi ajulile angangena kanjani nokuthi lezi zindawo zokucebisa zikhula kuphi.
7. Imiphumela engokoqobo ekuhlolweni kwezimbiwa
Ngenxa yokuthi amaphutha athinta kakhulu ukusatshalaliswa kwezimbiwa, amasu amaningi okuhlola agxile ekudwebeni kwesakhiwo. Ezinye zezinyathelo ezivamile zifaka:
– Ukumapha amaphutha kanye nokuqhekeka ensimini (ukuqondiswa, uhlobo lwephutha, ubufakazi bokunyakaza).
- Ukuhlaziywa kwezithombe zesathelayithi kanye ne-DEM ukuze kutholakale imigqa engabonisa amaphutha esifunda.
– I-Geophysics (i-magnetic, i-IP-resistivity, i-seismic) ukuthola izindawo zamaphutha, ukuguqulwa kanye nama-sulfide afihliwe.
– I-Geochemistry ukubona ukungalingani kwezinto eziyisisekelo okulandela imihubhe yamaphutha.
– Ukumodela kwesakhiwo se-3D ukubikezela izindawo zokudubula kwe-ore ngokusekelwe ezindaweni zokukhulisa, izindawo zokuhlangana kwamaphutha, noma izindawo zokwenyuka.
Ezinhlelweni eziningi, indawo lapho amaphutha amabili ahlangana khona (ukuhlangana) ngokuvamile yindawo lapho ukumbiwa kwamaminerali kunamandla khona ngoba ukumuncwa kwamanzi kuyanda futhi indawo evulekile inkulu.
Isiphetho
Amaphutha athinta ukusatshalaliswa kwamaminerali ngezindlela ezahlukene: asebenza njengezindlela eziyinhloko zokukhuphuka koketshezi oluphethe insimbi, adala isikhala sokufakwa kwe-ore, ashintsha izimo zomzimba namakhemikhali ezikhuthaza imvula, alawule izinhlobo zediphozithi, futhi asike futhi asuse imizimba ye-ore, ngaleyo ndlela enze kube nzima ukusatshalaliswa kwayo. Ngisho nangemva kokuba ukusatshalaliswa kwamaminerali sekuvele, amaphutha ayaqhubeka nokudlala indima ngokusheshisa ukuwohloka kwesimo sezulu nokuqondisa ukucebiswa kwe-supergene. Ngakho-ke, ukuqonda isakhiwo sephutha kubalulekile ekuchazeni amaphethini okusatshalaliswa kwamaminerali, ukunciphisa izingozi zokuhlola, kanye nokuklama amasu okumba asebenza kahle kakhulu.
Uma ufisa, ngingavumelanisa lesi sihloko nomongo wase-Indonesia (isb. izibonelo zama-epithermal egolide kuma-arcs ezintaba-mlilo, ama-porphyries ethusi-egolide, noma ama-nickel laterites) noma ngengeze imifanekiso yemibono efana nokukhulula ukugoba, ukunyathela, kanye nokususwa komzimba we-ore.
