da dutsen maganadisu kuma maganadisu na duwatsu suna da alaƙa da maganadisu na ma'adanai, wanda ke da matukar mahimmanci ga fahimtar hanyoyin bincike na magnetic geophysical. Yawancin ma'adinan dutsen suna nuna ƙarancin ƙarfin maganadisu, kuma dalilin da yasa duwatsu suke maganadisu shine cewa adadin ma'adinan maganadisu yawanci ƙanana ne. Ƙungiyoyin geochemical guda biyu ne kawai ke ba da duwatsu tare da waɗannan ma'adanai da magnetism.
A cikin wannan labarin za mu gaya muku duk abin da kuke buƙatar sani game da dutsen Magnetic, halayensu na magnetism na ma'adanai.
Mene ne dutsen maganadisu
Ƙungiyar baƙin ƙarfe-titanium-oxygen tana da ƙwaƙƙwarar mafita na adadin ma'adanai masu mahimmanci daga magnetite (Fe3O4) zuwa ulvöspinel (Fe2TiO4). Wani nau'in hematite na baƙin ƙarfe na yau da kullun (Fe2O3) shine antiferromagnetic don haka baya haifar da ƙarancin maganadisu. Tushen ƙarfe-sulfur yana ba da pyrrhotite ma'adinan maganadisu (FeS1 + x, 0 wanda ke da zafin jiki na Curie na 578 ° C.
Ko da yake girma, siffar da rarraba abubuwan magnetite a cikin dutsen za su yi tasiri ga halayen maganadisu, yana da kyau a rarraba halayen maganadisu na dutsen bisa ga abin da ke cikin magnetite gaba ɗaya.
Ire-iren duwatsun maganadisu
Saboda girman abun ciki na magnetite, manyan duwatsu masu banƙyama galibi duwatsun maganadisu ne. Matsakaicin magnetite a cikin duwatsu masu banƙyama yana raguwa tare da ƙara yawan acidity, don haka ko da yake acidic igneous rocks suna da nau'o'in maganadiso daban-daban, halayensu na maganadisu yawanci sun fi na asali duwatsu.
Halayen maganadisu na duwatsun metamorphic suma suna da canji. Idan matsa lamba na oxygen ya yi ƙasa, magnetite za a sake dawo da shi kuma ƙarfe da oxygen za su haɗu tare da sauran matakan ma'adinai yayin da matakin metamorphism ya karu. Duk da haka, in mun gwada da babban juzu'i na iskar oxygen zai iya haifar da samuwar magnetite, wanda ke aiki azaman ma'adinai mai ma'adinai a cikin halayen metamorphic.
Gabaɗaya magana, abubuwan da ke cikin magnetite da lalurar maganadisu na duwatsu sun bambanta sosai, kuma ana iya samun babban cikas tsakanin lithologies daban-daban. Yaushe Ana lura da anomalies na maganadisu a wuraren da aka rufe da sediments, anomalies gabaɗaya ana haifar da su ne ta hanyar ƙaƙƙarfan duwatsu masu banƙyama ko ginshiƙan ginshiƙai ko ɓangarorin kutsawa.
Abubuwan da ke haifar da rashin ƙarfi na maganadisu sun haɗa da levees, faults, folds ko truncations da lava flows, adadi mai yawa na kutsawa na asali, duwatsun ƙasa na metamorphic, da gawar magnetite. Girman magnetic anomaly jeri daga dubun nT a cikin zurfin metamorphic ginshiki zuwa daruruwan nT a cikin asali kutsa jiki jiki, da kuma girma na magnetite ma'adanai iya isa dubu da yawa nT.
Filin Magnetic da mahimmanci
Bayan shekaru uku na tattara bayanai, ya zuwa yanzu an buga shi mafi girman ƙudurin taswirar sararin samaniya na filin maganadisu lithospheric na duniya. Saitin bayanan yana amfani da sabuwar dabarar ƙirar ƙira don haɗa sakamakon auna daga tauraron dan adam Swarm na ESA tare da bayanan tarihi daga tauraron dan adam na CHAMP na Jamus, wanda ke baiwa masana kimiyya damar cire ƙananan sigina na maganadisu daga saman duniya. Ja yana wakiltar wuraren da filin maganadisu lithospheric yana da inganci kuma shuɗi yana wakiltar wuraren da filin magnetic lithospheric ba shi da kyau.
Shugaban tawagar Swarm na ESA Rune Floberghagen ya ce a cikin wata sanarwa: “Ba shi da sauƙi a fahimci tushen tauraruwar iyayenmu. Ba za mu iya amfani da shi kawai don auna tsarinsa, tsarinsa da tarihinsa ba.. Ma'auni daga sararin samaniya yana da matukar amfani tun da yake bayanin tsarin maganadisu ne na harsashi mai ƙarfi na duniyarmu.
A taron Kimiyya na Swarm da aka yi a Kanada a wannan makon, sabon taswirar ya nuna cikakken sauye-sauye a fagen tare da daidaito fiye da sake gina tushen tauraron dan adam na baya, wanda ya haifar da tsarin yanayin kasa a cikin ɓawon burodin duniya.
Ɗaya daga cikin abubuwan da ba a sani ba ya faru a Jamhuriyar Afirka ta Tsakiya, wanda ke kan Bangui, inda filin maganadisu ya fi karfi da karfi. Har yanzu dai ba a fayyace dalilin da ya haddasa wannan matsalar ba, amma wasu masana kimiyya sun yi hasashen hakan zai yiwu zama sakamakon tasirin meteorite fiye da shekaru miliyan 540 da suka wuce.
Filin maganadisu yana cikin yanayi na dindindin. Canjin Magnetic arewa da polarity yana canzawa kowane ƴan shekaru dubu ɗari, don haka kamfas ɗin yana nuna kudu maimakon arewa.
Sandunan maganadisu
Lokacin da aikin volcanic ya haifar da sabon ɓawon burodi, galibi a gefen teku, ma'adinan ƙarfe masu ƙarfi a cikin magma mai ƙarfi za su fuskanci magnetin arewa, don haka ɗaukar "hoton" filin maganadisu da ake samu lokacin da dutsen ya huce.
Yayin da igiyoyin maganadisu ke motsawa gaba da gaba akan lokaci. ma'adanai masu ƙarfi suna samar da 'yanki' akan benen teku kuma suna ba da rikodin tarihin maganadisu na duniya. Sabuwar taswirar Swarm tana ba mu bayanin da ba a taɓa yin irinsa ba game da ribbon da ke da alaƙa da farantin tectonics, wanda ke nuna gefen ƙoƙon tsakiyar teku.
“Wadannan igiyoyin maganadisu shaida ne na juyar da sandar maganadisu, kuma nazarin sawun maganadisu a kan tekun na iya sake gina sauye-sauyen da suka gabata a cikin filin maganadisu. Har ila yau, suna taimakawa nazarin fasahar tectonics, "in ji Dhananjay Ravat na Jami'ar Kentucky.
Sabuwar taswirar tana bayyana halayen filin maganadisu tsayin kusan kilomita 250 kuma zai taimaka bincika yanayin ƙasa da zafin jiki na lithosphere na duniya.
Dutsen maɗaukaki kuma suna da mahimmanci daga mahangar dutsen maganadisu. Kuma wajibi ne a yi la'akari da cewa a cikin ƙasa akwai adadi mai yawa na ƙarfe.
Ina fatan da wannan bayanin zaku iya ƙarin koyo game da duwatsun maganadisu, mahimmancin su da sandar maganadisu na duniya.