Structure \u00e0 grains fins : Grains min\u00e9raux d'un diam\u00e8tre inf\u00e9rieur \u00e0 1 mm, \u00e0 la texture d\u00e9licate (comme la masse rocheuse de Niuchangshan). Structure \u00e0 grain moyen : Grains d'un diam\u00e8tre de 1 \u00e0 5 mm, de texture uniforme (courants dans la plupart des masses granitiques). Structure \u00e0 gros grains : Grains de plus de 5 mm, certains atteignant le niveau du centim\u00e8tre, avec une texture l\u00e2che (comme le granite de Jingzhen).
Types de structures sp\u00e9ciales :
Structure porphyrique : Contient des ph\u00e9nocristaux de grande taille (p. ex. feldspath potassique, diam\u00e8tre 1 cm) noy\u00e9s dans une matrice \u00e0 grain fin (comme le sp\u00e9cimen de Heihe City).
Structure porphyrique : Une transition naturelle dans la taille des grains entre les cristaux et la matrice.
Structure vallonn\u00e9e : Des trous se d\u00e9veloppent dans la roche, remplis de cristaux de quartz ou de feldspath.
Structure gneissique : la covite et d'autres min\u00e9raux en feuillets sont dispos\u00e9s de mani\u00e8re directionnelle (sous l'effet de la d\u00e9formation tectonique).
La structure du granit
La structure fait r\u00e9f\u00e9rence \u00e0 la distribution min\u00e9rale globale de la roche. Le granite est domin\u00e9 par une structure massive :
Structure massive : Les min\u00e9raux (quartz, feldspath, muscovite) sont r\u00e9partis uniform\u00e9ment et dispos\u00e9s de mani\u00e8re directionnelle, ce qui repr\u00e9sente la majorit\u00e9 du granite.
Autres structures rares :
Structure sph\u00e9ro\u00efdale : Les min\u00e9raux s'agr\u00e8gent en forme de sph\u00e8re (comme certains granits m\u00e9tamorphiques).
Structure porphyrique : La distribution des min\u00e9raux est in\u00e9gale, avec un enrichissement local.<\/li>\n<\/ol>\n\n\n\n
M\u00e9canisme de formation Structure refers to the size, shape, and arrangement of mineral grains. Granite is typically characterized by a crystalline granitic structure with semi-idiomorphic-idiomorphic mineral grains, coarse grain size, and time-crystallized (accessory minerals crystallize first, followed byz filling the gaps). The main types include: Formation mechanismStructural differences stem from the rate of magma and depth: slow cooling…<\/p>","protected":false},"author":1,"featured_media":1925,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[35],"tags":[],"class_list":["post-1921","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"taxonomy_info":{"category":[{"value":35,"label":"NEWS"}]},"featured_image_src_large":["https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/02\/\u5fae\u4fe1\u56fe\u7247_20260226085922_9_11-768x1024.jpg",768,1024,true],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/fr\/author\/jtlcnc\/"},"comment_info":0,"category_info":[{"term_id":35,"name":"NEWS","slug":"news","term_group":0,"term_taxonomy_id":35,"taxonomy":"category","description":"","parent":0,"count":119,"filter":"raw","cat_ID":35,"category_count":119,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/1921","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/comments?post=1921"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/1921\/revisions"}],"predecessor-version":[{"id":1926,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/1921\/revisions\/1926"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media\/1925"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media?parent=1921"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/categories?post=1921"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/tags?post=1921"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Les diff\u00e9rences structurelles sont li\u00e9es \u00e0 la vitesse du magma et \u00e0 la profondeur : un refroidissement lent dans un environnement profond (>3 km sous terre) forme une structure \u00e0 grains moyens et grossiers ; un refroidissement rapide ou un m\u00e9lange de magmas peut conduire \u00e0 une structure orphyrique\/\u00e0 grains fins (comme l'injection de magma mafique produisant de la perthite).<\/p>\n\n\n\n![\"\"](\"https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/02\/\u5bfc\u8f68.jpg\")
<\/figure>","protected":false},"excerpt":{"rendered":"