whole Luks header lost?

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Hello,
I wanted to format an sd-card but instead  of typing gparted /dev/mmcblk0
I typed gparted...so I started to format the /dev/md3 disk instead of
/dev/mmcblk0
when I understood what was happening I canceled the operation
Then I re-launched gparted and it displayed that the disk was unformated
or something like that.
Here's my setup:
2 partitions->raid0->LUKS

I wonder if the whole header is lost of just a part of it...Mabe we could
get the salt back and open the partition?

here's hexdump -C /dev/md3  | head -n 100:
# hexdump -C /dev/md3  | head -n 100
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
|................|
*
00000210  00 00 00 00 00 00 00 00  00 00 06 08 00 00 0f a0 
|................|
00000220  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00 
|................|
00000230  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
|................|
00000240  00 00 00 00 00 00 00 00  00 00 07 08 00 00 0f a0 
|................|
00000250  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
|................|
*
00000400  00 40 70 01 20 41 e0 02  0e d0 24 00 91 ca db 02  |.@p.
A....$.....|
00000410  73 9a f2 02 00 00 00 00  02 00 00 00 02 00 00 00 
|s...............|
00000420  00 80 00 00 00 80 00 00  00 40 00 00 77 3f 63 48 
|.........@..w?cH|
00000430  f5 75 55 49 04 00 22 00  00 00 03 00 01 00 00 00 
|.uUI..".........|
00000440  c0 a5 62 48 00 00 00 00  00 00 00 00 01 00 00 00 
|..bH............|
00000450  00 00 00 00 0b 00 00 00  80 00 00 00 0c 00 00 00 
|................|
00000460  02 00 00 00 03 00 00 00  b1 8f c3 a2 76 96 4c f3 
|............v.L.|
00000470  9d 41 b1 58 49 23 c6 25  00 00 00 00 00 00 00 00 
|.A.XI#.%........|
00000480  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
|................|
*
000004e0  08 00 00 00 00 00 00 00  00 00 00 00 0d 0d 16 31 
|...............1|
000004f0  70 ce 43 10 bb df 93 c7  19 f4 ee d4 02 01 00 00 
|p.C.............|
00000500  00 00 00 00 00 00 00 00  7f 5c e9 45 14 02 00 00 
|.........\.E....|
00000510  15 02 00 00 16 02 00 00  17 02 00 00 18 02 00 00 
|................|
00000520  19 02 00 00 1a 02 00 00  1b 02 00 00 1c 02 00 00 
|................|
00000530  1d 02 00 00 1e 02 00 00  1f 02 00 00 20 02 00 00  |............
...|
00000540  21 06 00 00 00 00 00 00  00 00 00 00 00 00 00 08 
|!...............|
00000550  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
|................|
*
00001000  4e 2e 7f 8b c0 6c 3f d1  68 49 1c 52 5e 2c 13 40 
|N....l?.hI.R^,.@|
00001010  06 fd 6e 8a cd d3 bd 07  d5 ea 39 14 0e 3c 2b 7b 
|..n.......9..<+{|
00001020  7e 01 86 ee 11 55 23 8e  9d 0b 95 ef 1c b7 f7 df 
|~....U#.........|
00001030  da 8a 4b 63 ed 4f 0b ef  08 f4 f1 21 34 28 69 3e 
|..Kc.O.....!4(i>|
00001040  4b c8 0e f8 44 30 ef 26  07 bf 66 21 28 c0 57 e7 
|K...D0.&..f!(.W.|
00001050  2a 65 68 d4 90 a0 2c 01  ce a4 1f 1c 10 a9 13 80 
|*eh...,.........|
00001060  73 e4 de 54 5a d4 ee 47  1a 06 3f 77 77 f4 a3 cd 
|s..TZ..G..?ww...|
00001070  28 64 60 27 c4 56 aa b8  39 8a 10 72 82 73 2b db 
|(d`'.V..9..r.s+.|
00001080  92 d7 72 62 56 dd 34 0c  71 bc b2 30 7d 52 7e b3 
|..rbV.4.q..0}R~.|
00001090  a3 e1 4e 4f 55 c5 28 83  23 af 99 4e 60 d2 0e 37 
|..NOU.(.#..N`..7|
000010a0  0f ec 64 c1 2e 72 17 cc  f1 0e f2 ff 64 4c 4d 63 
|..d..r......dLMc|
000010b0  ed 72 33 ee e9 6b 03 e2  cb 07 36 a5 27 2a 27 b7 
|.r3..k....6.'*'.|
000010c0  ac 6b 34 ac e5 d7 87 93  51 bf 05 95 6c b3 3c 00 
|.k4.....Q...l.<.|
000010d0  45 b5 3b 4c 7e 9d 33 71  3f b1 98 2f 60 59 3d 77 
|E.;L~.3q?../`Y=w|
000010e0  6a 25 75 9c 44 15 c3 5f  52 7c 57 82 75 25 5e 1b 
|j%u.D.._R|W.u%^.|
000010f0  2b 46 48 f8 84 a9 5d 33  e1 f1 a5 50 0d 33 75 45 
|+FH...]3...P.3uE|
00001100  6a c9 fe 95 2f 47 60 bd  ad 09 1a 0e cd 17 44 ce 
|j.../G`.......D.|
00001110  23 20 a3 29 72 d7 ca 38  45 a8 31 0d 85 14 bd 5b  |#
.)r..8E.1....[|
00001120  67 12 b5 a2 0d f1 40 45  a1 f1 26 17 48 89 f3 26 
|g.....@xxx&.H..&|
00001130  d5 57 5c 5e b4 27 2e df  a4 74 1e ad 14 cd 8a 6e 
|.W\^.'...t.....n|
00001140  20 b0 13 81 5f af 16 eb  85 dc 55 a3 05 81 ae a5  |
..._.....U.....|
00001150  2b 3d 7f 6a 85 49 96 78  e7 28 3c 0c 4a 61 15 ec 
|+=.j.I.x.(<.Ja..|
00001160  2c 9a 61 2c 72 05 2e 73  38 3e 0f c4 e4 8b d0 40 
|,.a,r..s8>.....@|
00001170  25 a7 dc 8b 06 53 cf 81  5f bb c8 a8 c7 6f 63 41 
|%....S.._....ocA|
00001180  0b d4 29 41 d8 27 85 a3  81 e3 e6 a2 13 4d 57 db 
|..)A.'.......MW.|
00001190  21 22 89 2b 16 7b 12 0f  25 ec 1e f1 47 02 3c 49 
|!".+.{..%...G.<I|
000011a0  d5 3b 67 e1 8d 25 76 f5  4f 9f dc 60 01 4c 51 66 
|.;g..%v.O..`.LQf|
000011b0  32 78 d7 38 51 43 d8 97  df 89 d2 d8 90 25 96 1f 
|2x.8QC.......%..|
000011c0  0b da e9 23 ec a2 89 16  cd b1 68 e3 f7 f9 6a c4 
|...#......h...j.|
000011d0  00 23 1e d6 0e 0b 94 b8  1b f0 53 e9 0c 30 76 64 
|.#........S..0vd|
000011e0  08 42 2b 2c 73 90 93 60  89 e9 f0 64 55 3c 23 21 
|.B+,s..`...dU<#!|
000011f0  70 89 97 45 e4 49 a5 d0  f9 4b 25 4b 77 c1 96 81 
|p..E.I...K%Kw...|
00001200  11 49 12 65 36 25 a6 46  89 b1 ff b2 53 11 6d 0d 
|.I.e6%.F....S.m.|
00001210  ac 33 ae 68 03 c1 bc 01  d8 b6 f0 98 7c 0f 18 db 
|.3.h........|...|
00001220  e4 73 84 0d a6 28 11 07  92 d4 a0 51 b0 bb f0 41 
|.s...(.....Q...A|
00001230  78 bc 32 4a ae 70 e8 63  94 d0 0c b4 6a 95 59 a9 
|x.2J.p.c....j.Y.|
00001240  a1 01 ce 82 0e 94 22 e2  e8 1b 95 81 57 91 53 61 
|......".....W.Sa|
00001250  5d 06 04 81 49 4e 67 cd  44 b6 bd e1 c9 9e 76 90 
|]...INg.D.....v.|
00001260  61 4e 29 ab 83 22 94 24  dc 6d f8 fb d4 b2 25 f5 
|aN)..".$.m....%.|
00001270  ae fa 71 ab b8 4e 62 44  c0 08 a5 b2 37 e8 e4 18 
|..q..NbD....7...|
00001280  db 08 df 09 e9 00 58 fe  9a 21 1d 2e bd 72 78 8c 
|......X..!...rx.|
00001290  d9 0b 57 99 12 10 10 16  e0 74 8b f7 79 ba 7f 8d 
|..W......t..y...|
000012a0  f5 e5 71 a5 b9 4f 12 1c  f5 a0 91 57 81 35 cd b9 
|..q..O.....W.5..|
000012b0  25 01 d5 b3 4d 58 95 a6  ba 65 81 92 ce 31 99 9d 
|%...MX...e...1..|
000012c0  f1 0b 83 82 5f 63 1a c3  fa ad ec 69 68 6c cf 87 
|...._c.....ihl..|
000012d0  7d a6 c0 63 7e 16 ed ea  1a 30 db ed 88 76 62 d7 
|}..c~....0...vb.|
000012e0  1e b4 f2 41 25 e9 d5 00  d9 77 ee fd e3 b3 8b 85 
|...A%....w......|
000012f0  18 46 30 25 c7 67 87 e0  3c a4 8a 5d ff cb 1f 65 
|.F0%.g..<..]...e|
00001300  e8 d1 85 e3 6a a7 ee 3e  58 b3 ae 05 c1 93 e0 9f 
|....j..>X.......|
00001310  d4 83 d8 41 79 89 41 9d  5a 38 93 b9 b7 3e f1 71 
|...Ay.A.Z8...>.q|
00001320  81 af 20 91 d5 26 84 47  83 91 d2 08 53 81 79 4c  |..
..&.G....S.yL|
00001330  19 43 f1 4e 47 3b d4 7b  da 6c f0 87 ec 60 f0 8c 
|.C.NG;.{.l...`..|
00001340  8e 28 45 73 ed c2 f6 d1  6a 2a a9 c1 36 60 41 a8 
|.(Es....j*..6`A.|
00001350  f1 41 f1 9e 88 21 ae 01  56 5e 26 ee 17 86 41 84 
|.A...!..V^&...A.|
00001360  f4 d9 51 86 de bb 3e c9  f7 b2 af 2b d7 52 3f ad 
|..Q...>....+.R?.|
00001370  b2 f1 1a f4 33 8c d6 c3  6e b4 35 77 b0 5a 1f 9d 
|....3...n.5w.Z..|
00001380  6d 23 f6 b0 5f b0 c5 9d  19 53 cf 2e 24 79 dc 59 
|m#.._....S..$y.Y|
00001390  25 db 16 4f be bc cd 73  1e 05 96 d5 0a f2 03 d5 
|%..O...s........|
000013a0  ff 1f ad d8 13 d7 02 30  99 e7 6c 23 7c 26 6c f3 
|.......0..l#|&l.|
000013b0  5f f1 9a f4 0f 0e 84 f8  87 21 69 4c 84 ee f1 bb 
|_........!iL....|
000013c0  5b 57 86 f3 c7 4e ac 1c  ee 07 e3 2e d4 98 1a a7 
|[W...N..........|
000013d0  db 4d 1b 60 43 2e 48 2a  0c 3a bd be bc 1b 43 bd 
|.M.`C.H*.:....C.|
000013e0  e6 02 77 51 aa d6 60 7f  c0 48 db f2 e7 db cd a4 
|..wQ..`..H......|
000013f0  32 85 b0 27 37 36 ed bd  33 7b 06 32 23 75 49 90 
|2..'76..3{.2#uI.|
00001400  ce f6 06 bc f0 37 ec 59  d3 b7 ed a9 79 35 d1 c3 
|.....7.Y....y5..|
00001410  65 84 04 b3 d2 e7 b8 32  4c b5 a5 0c 08 94 57 f5 
|e......2L.....W.|
00001420  76 1c 8b e0 7e 28 5e 21  de 50 da f9 b8 c8 e1 1f 
|v...~(^!.P......|
00001430  6f e5 f1 2b 1c 9b 12 2d  ed bf 2d 83 13 9c 94 7d 
|o..+...-..-....}|
00001440  e2 4c 1c 20 a3 d8 23 58  96 2e 0a 0c a6 be 0e 83  |.L.
..#X........|
00001450  35 b2 28 45 10 ae b2 38  3d 44 31 dc 20 d0 9f 24  |5.(E...8=D1.
..$|
00001460  0e f5 6f 87 23 5f a5 91  3c 12 f0 82 aa 54 0f 2f 
|..o.#_..<....T./|
00001470  35 79 d2 e9 79 9a d2 be  9a ff 69 8a c7 59 49 4c 
|5y..y.....i..YIL|
00001480  de 1d a9 e0 c6 a7 c9 55  ca ef 9d 25 98 4a 6a 58 
|.......U...%.JjX|

thanks a lot for your help in advance...


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