Địa hình và khoáng hóa thiếc sa khoáng vùng Đông Bắc Tam Đảo

/-c<br /> <br /> DIA HINH VA KHOANG H9A TTU6C<br /> SA KHOANG<br /> <br /> wNG oOxc nAc<br /> <br /> Tan4<br /> <br /> DAo<br /> rnAN<br /> <br /> ufr<br /> <br /> rcrerlrr<br /> <br /> -<br /> <br /> Giai doan ddu : giai cloan thAnh rao<br /> c6c mo<br /> tngv6i thoi kj troaiaOng Liah-,- n.ng<br /> lOn vihoat dOng magma manh (Triat<br /> muOn vd Creta<br /> muOn), rao nOn cAc dang clia hinh<br /> nrii irong vung<br /> (Tam Drio, Nrii Dicng, NOi ph6o,<br /> Nni Cfrna...l.<br /> thiec geic,<br /> <br /> mo quang goc rrong vung<br /> 00 m. Trong giai doan nAy<br /> an rrong song vai tro<br /> <br /> cLja<br /> <br /> trong.<br /> <br /> - Giai doan hai :bitt ddu c6 su ph6<br /> huy cAc thAn<br /> qu4ng.gdc vd d6 vAy quanh cld iao<br /> u6 ptrong noa,<br /> trong khung cinh ha thap dia hinh<br /> n6i'chung, ,ao<br /> n€n dang dia hinh ddi, n6i thdp, vdi<br /> do sau Jio .dt<br /> thuAn loi cho hoin luu nudc ngdm<br /> cdn ihiei cho qua<br /> jrinn l!o.1.S.tro6. Trong giaidoan ni;,chOdO ti.n too<br /> tuong d6i binh dn trong didu kiOn<br /> tili traLr nOng am.<br /> <br /> - Giai doan 3 : kho1ng vAt caxiterit duoc di<br /> chuydn vd t6ch ra khdi tang Aa'Ui phong<br /> i,oa rnern<br /> bo. eu6.trinh mang di naytuoc inl.<br /> JFy'uJi rrou,<br /> tieh tao nang khdng ldn trong didu<br /> <br /> ilnq<br /> hau am<br /> <br /> vd d6 phAn cat diahinh<br /> <br /> trun! binh.<br /> <br /> k; ;[i<br /> <br /> c kho6ng<br /> <br /> oing<br /> <br /> vAt<br /> <br /> hinh Am<br /> <br /> u hudng<br /> inh phAn<br /> <br /> no<br /> hot<br /> ph;<br /> <br /> ong cao,<br /> <br /> ra theo chu ky, song do rr tl<br /> qhal ai trong luc md tdng sin phaim chua caxiterii<br /> thudng rap hung vao d6yiua cic<br /> trAm if.f-r LJ'.0r.<br /> Qu6 trinh thdnh tao c6c<br /> ving xAy ra rheo 4 giai doan<br /> 1.56<br /> <br /> sa kho6ng<br /> :<br /> <br /> thi0t trong<br /> <br /> so v6i c6c thdm<br /> <br /> nlm<br /> <br /> tloone cao hoh<br /> #t "#fiH<br /> <br /> MOt sd khu vuc do<br /> d6 hod ran (KhuAn<br /> nOn dia hinh d6y th<br /> dot ngot, hodc hinh<br /> lim cho c<br /> qhan ry h€i sfic phric tap, gay kh6<br /> -- kh6n<br /> v'r! viec<br /> "r'wr cho<br /> tim kiem vd tharndo thohnis,in.<br /> tgp. Didu ndy<br /> <br /> Ngodi d4ng dia hin<br /> caxiterit cdn c6 thd tim<br /> <br /> 1. Cdc kidu sa kho1ng vdng<br /> d6ng bdc Tam Ddo<br /> <br /> b) sa<br /> Liing, Nri<br /> ch6 hoic<br /> li0n quan<br /> tai cfra c6<br /> liOn quan<br /> <br /> 2. Ddc didm dla hinh chua<br /> sa khoilng thi6c<br /> a) Cdc dqng dia hinh chta sa<br /> khodng thi€t.<br /> <br /> :<br /> -lfing c6 rhd grp c6c sa<br /> n''Tu<br /> :*:T^i:::<br /> rrong c6c. :i<br /> "'''i$. 6"un,<br /> rnungiune<br /> 313,1d<br /> thung<br /> <br /> ?1,^ntl,<br /> <br /> i:l<br /> <br /> Y<br /> <br /> ;*<br /> <br /> ;il;;ii;?:<br /> <br /> ilil ;;;<br /> l*: j:r,I::nu-': :i i;*'il;;<br /> tl''e' ua ffi<br /> ff it" 1H':";J:":^r .1Tl4" .;; ;h*;"ifl ";?.ii<br /> s?"""J<br /> li:lg,*:;"1'lill"se<br /> khu<br /> vuc c6 rhdc6 z ua. tne",,<br /> iAJ;", #",<br /> Thdm bdc 2<br /> <br /> m?nh;rh<br /> <br /> :<br /> <br /> nim Fen, c6 tudi<br /> <br /> ccj vd bi c6t xd<br /> <br /> chrla c6c<br /> <br /> dang phA<br /> srin phdm<br /> <br /> set dat tor 5G60 Vo. H<br /> n-qh"o, trung binh khoinl<br /> t6i 500 g/mr lOl.<br /> <br /> I : tr6 hon vi nim du6i thdm b4c 2<br /> :<br /> dia hinh co bdn ctrriu<br /> 3.dTg<br /> B6c liing, Ngdi Chd, Ngdi<br /> "uxit"J'fa'#ra<br /> r4m,<br /> iJ<br /> Thelm bac<br /> <br /> lucrng caxiterir tudns<br /> <br /> aoi ci"<br /> <br /> irirnili.,<br /> j"f jiiToi<br /> ,oi<br /> 157<br /> <br /> thung<br /> chidu<br /> didm<br /> thudn<br /> <br /> m.<br /> dac<br /> <br /> ddv<br /> <br /> di;<br /> <br /> hinh d6y thung l0ng. MOt s0 noi b€ ddy ciia chirng<br /> khe ldn, v6i him luong caxiterit cao. Thdnh phdn<br /> aluvi trong thdm ndy c6 do chon loc kh6 tot, phan<br /> <br /> lop<br /> <br /> thinh<br /> <br /> vdo d0 phAn c6t c6c sudn md sa kho6ng ndy duoc<br /> mp hung lai trong c6c khe r6nh tr€n suon, tao nOn<br /> <br /> mdnh vun cria d6 phieh, d6 voi hoac c6c mdnh vun<br /> cta d6 granit. Aluvi treii qua nhidu giai doan trdm<br /> tich kh6c nhau, rao nOn c6c lop c6 chidu ddy, tinh<br /> chdt, do gdn ket vd rhanh phAn vat chdt kh6c nhau.<br /> <br /> D6y thung lDng : phu rhuOc vio ddc didm thach<br /> hoc d6 gOc noi c6c thung lfrng cdt x€ qua md clia<br /> hinh d6y thung lflng c0ng hdt srlc kh6c nhau. Tai<br /> c6c thung lflng ph6t tridn tren d6 v6i, d6y thung<br /> lflng thudng c6 dang ldi l6m phric tap, rao nen cac<br /> hang hOc, c6c bAy c6 khri ndng chua caxiterit gidu.<br /> Su duy tri thAn qudng theo chidu ngang vi theo<br /> chidu thang dring o day thuong thay d(ii m4nh.<br /> Con c6c thung lfrng ph6t tridn tr€n d6 phidn, c6t bOt<br /> kci rhi be dAy rhan sa kho6ng cjn dinh hon.<br /> <br /> cOng nghi0p.<br /> <br /> .- C6c bd mer san bang : ld dang dra hinh phlt<br /> tridn chrj ydu rr€n ldp v6 phong noa, 6 Aay gap cac<br /> sa khoAng thidc eluvi-deluvi. N6t dac trLrng cita clc<br /> <br /> lOn<br /> <br /> khi di tu thudng ngudn vd ha ngudn, tri ria vdo<br /> fung tam vd, ru tren xu6ng du6i thung lfrng. Tuy<br /> nhien rong m6i thAn quAng hdm luong caxiterit lai<br /> girim di khi ti le s6t tang cao. d l6p l6t d6y hdm<br /> luong caxiterit bi girim xuOng do c6c hat kho6ng<br /> vAt niy chi tAp trung cqc b0 trong cdc hang h6c, kd<br /> n0t ren mer da gdc mi chring kh6ng duoc phAn b6<br /> <br /> c6c sa khoAng nAy clng it c6<br /> <br /> I.<br /> <br /> Dqc didm hinh th5i<br /> <br /> kho6ng sdng<br /> <br /> Min<br /> 93,8<br /> 60<br /> <br /> Bang phuong phdp phan tich hinh th6i vd tr6c<br /> Iuong hinh th6i, chring rOi d6 x6c dinh duoc cic<br /> dic didm hinh thdi ve tr6c luong hinh th6i ctla c6c<br /> khu vuc chfa sa kho6ng thidc (bdng t).<br /> <br /> 40<br /> <br /> J<br /> <br /> 61,9<br /> <br /> tn I<br /> <br /> t,z<br /> <br /> 74<br /> <br /> 10,4<br /> 16,9<br /> 22<br /> <br /> 200<br /> 40<br /> 40<br /> <br /> 5)5<br /> <br /> t7,3<br /> t5<br /> <br /> 180<br /> <br /> l0<br /> <br /> 200<br /> <br /> 66,4<br /> <br /> o<br /> <br /> 66\<br /> <br /> Ngdit"em<br /> Tit TrAm<br /> <br /> 10,9<br /> 70<br /> 70<br /> <br /> Phuc Linh<br /> <br /> 48<br /> <br /> r58<br /> <br /> VAn<br /> <br /> 54<br /> <br /> (m/km2) r[.'tt#t<br /> <br /> 40<br /> <br /> 75<br /> 85<br /> <br /> Ci<br /> <br /> Chenh cao<br /> <br /> M(rc d0 phAn cir<br /> S<br /> Ncanp<br /> <br /> 57s<br /> <br /> Ngon Ddng<br /> KhuAn PhAy<br /> <br /> Ngoi Chd<br /> <br /> rugng hinh th5i c5c khu vr,rc chr?a sa kho6ng thi6t<br /> <br /> 74,3<br /> <br /> tang Ci<br /> Ky l-.Am<br /> <br /> 6))<br /> 65<br /> 45<br /> 48<br /> <br /> rri cdng nghiep.<br /> <br /> b) Ddc didm hinh thdi vd trdc lrrong hinh thdi<br /> <br /> Dao cao (m)<br /> <br /> T€n<br /> <br /> Bic Lfrng<br /> KhuAn Th€<br /> <br /> vi tric<br /> <br /> gi<br /> <br /> cdc khu vuc chta sa khodng thi€c<br /> <br /> d€u tr€n todn b0 bd mat ndy.<br /> Bdng<br /> <br /> b6y chria sa kho6ng.<br /> <br /> - Dia hinh sudn niri : c6 rhd gip sa khoAng thi6c<br /> deluvi tren c6c sudn nfii, sudn ddi. D6 IA c6c tich<br /> tu caxiterit dang tr€n dudng di chuydn. phu thuOc<br /> <br /> Cic tdng chria sdn phdm c6 thd nim<br /> xen kep cDng v6i c6c lop khOng chfa qu{ng.<br /> Thdnh phdn rrdm tich : c6r, s6t, cuoi, s6i l5n c6c<br /> 16 rAng.<br /> <br /> Hdm luong caxiterit trong thung l0ng tang<br /> <br /> nOn c6c<br /> <br /> 1,2<br /> <br /> 40<br /> 200<br /> <br /> 0,8<br /> 0,8<br /> <br /> Mar d0<br /> lineament<br /> (km/km2)<br /> 0,6<br /> <br /> r,0<br /> <br /> o4<br /> 04<br /> <br /> 0,6<br /> <br /> 0,9<br /> <br /> 0,6<br /> <br /> 1,2<br /> <br /> 06<br /> 1)<br /> <br /> )^<br /> )n<br /> <br /> 0,4<br /> 0,4<br /> <br /> 70<br /> <br /> 0,8<br /> 0,7<br /> <br /> o5<br /> <br /> 40<br /> <br /> n1<br /> <br /> 0)<br /> <br /> r80<br /> <br /> 1,2<br /> <br /> tl<br /> <br /> oo<br /> @<br /> <br /> bg-<br /> <br /> E€aoil<br /> <br /> b'<br /> g<br /> <br /> I<br /> <br /> i<br /> <br /> €<br /> <br /> x<br /> <br /> rni<br /> <br /> F9€<br /> Nj65il<br /> <br /> C..)<br /> <br /> $l<br /> <br /> .,!. >i .-><br /> >=i >=<br /> <br /> o.i \oi<br /> -i<br /> <br /> oo;<br /> Ni s<br /> oo<br /> <br /> 6l<br /> <br /> r<br /> <br /> r.)<br /> <br /> s<br /> <br /> (f)<br /> <br /> o\<br /> <br /> /6<br /> <br /> I<br /> <br /> I<br /> <br /> b0<br /> bI<br /> <br /> \(t<br /> c) cl\(€<br /> <br /> '16)<br /> <br /> -qo<br /> <br /> :l<br /> <br /> lz<br /> JZ<br /> <br /> C)<br /> <br /> \pj<br /> t.i<br /> Oi<br /> boi<br /> <br /> H<br /> 6.<br /> <br /> J<br /> I<br /> <br /> E<br /> bn<br /> bo<br /> <br /> I<br /> <br /> 6.<br /> <br /> o<br /> <br /> J.<br /> a0<br /> <br /> ht)<br /> <br /> bo<br /> <br /> \c!<br /> <br /> E<br /> <br /> .<br /> <br /> tr<br /> !O<br /> rtr<br /> Et<br /> <br /> ,o<br /> <br /> J<br /> Od<br /> <br /> rO<br /> <br /> {<br /> <br /> cv<br /> (Ai<br /> <br /> 1<br /> <br /> .J<br /> <br /> o<br /> <br /> (€.<br /> <br /> €.<br /> <br /> d.<br /> <br /> bo<br /> <br /> bo<br /> <br /> F<br /> <br /> bI)<br /> <br /> bo:<br /> r=!<br /> Hi<br /> bo:<br /> \G!<br /> <br /> E<br /> <br /> z<br /> <br /> bI'<br /> <br /> F<br /> <br /> H<br /> y -.=<br /> =l<br /> E<br /> )l<br /> F'* =l t!ii<br /> I<br /> <br /> -<br /> <br /> -6)<br /> <br /> o<br /> <br /> c<br /> <br /> o<br /> <br /> .g<br /> <br /> 'i<br /> <br /> >5:<br /> <br /> axi<br /> <br /> i<br /> <br /> l':<br /> <br /> =i<br /> <br /> F<br /> <br /> o<br /> <br /> F<br /> <br /> >=i .'i>i<br /> >5t<br /> =i<br /> <br /> ()<br /> <br /> l5<br /> <br /> bo<br /> <br /> .l!o<br /> <br /> ! .r 'ii<br /> <br /> ,i'rl<br /> <br /> 7.<br /> ?<br /> I<br /> <br /> 'd,)<br /> <br /> .5<br /> <br /> bo<br /> <br /> +<br /> <br /> &<br /> <br /> '4)<br /> <br /> '