ギャラリー

リチウム探査でペグマタイトが重要な理由

当社の地質担当者は、スポジュメンを探しています。これはペグマタイトに含まれるリチウム含有鉱物です。ペグマタイトは、花崗岩や片岩（熱と圧力により形成された層状岩石）を切る明色（多くは白色）の岩石です。観察に適しているのは、岩石の露頭や、鉱脈を追って掘られた古い小規模手掘り坑道で、鉱脈を地下まで確認できます。

リチウムを探す第一歩は、スポジュメンを見つけることです。その起点となるのがペグマタイトです。Atlanticoの現地調査チームは、Novo Cruzeiroプロジェクト全域でこの対象をマッピングし、サンプリングしています。

ペグマタイトを見つけよう

学んだポイントを実際の写真で確認しましょう。最初の二枚の写真では、小規模手掘り坑道内の大規模な白色ペグマタイト岩体に注目してください。三枚目の写真は片岩中の薄い脈が重なる帯状部を、四枚目は地表で風化したペグマタイトを示しており、いずれもサンプリングする価値があります。

Pegmatite vein exposure with internal banding

Pegmatite vein exposed against schist in gallery wall

Banded pegmatitic vein with quartz, feldspar, and biotite layers

Deeply weathered pegmatite with clay-rich and iron-stained zones

紫外線下のペグマタイト

複数の小規模手掘り坑道内で、地下のペグマタイト脈を観察しています。地質担当者はUV光を用い、蛍光がリチウム濃集部と対応する可能性のある副成分鉱物を識別します。

Orange fluorescence on pegmatite under UV light

Blue-green fluorescence on pegmatitic sample under UV light

UV light on pegmatite surface showing faint orange fluorescence

Multicolour fluorescence on pegmatite under UV light

Blue fluorescence highlighting possible quartz-rich zones.

Blue-green fluorescence on pegmatite under UV light

手工鉱山での発見

過去に手掘りされた坑道は、ペグマタイト脈を地表から追跡しています。こうした露出は、マッピング、サンプリングおよび初期地質解釈の指針となる有用な現地観察情報です。

Artisanal tunnel within weathered rock at Novo Cruzeiro.

Entrance to artisanal working in weathered pegmatite

Atlantico field geologist collecting samples from an artisanal tunnel exposure at Novo Cruzeiro.

Pink saprolite exposure with biotite and tourmaline textures

Six-metre artisanal excavation exposing a lenticular pegmatite vein.

小さな手作業の発掘の入口で地質学者

通り沿いの露頭で明らかになった手作りの鉱山開口部

Geologist examining a small artisanal tunnel developed in weathered granitic rock.

懐中電灯で照らされた手作業のギャラリー内部

Shallow mine entrance with oxidized pegmatitic material

Hand-dug subsurface gallery exposing a pegmatitic zone within weathered host rock at Novo Cruzeiro.

Geologist examining weathered pegmatite at mine entrance

片岩ホスト岩内のペグマタイト鉱脈、職人ギャラリー内部に露出

Pegmatite vein exposed against schist in gallery wall

Pegmatite vein parallel to foliation in schist.

Rust-stained pegmatite wall inside an artisanal excavation

Pegmatite vein cutting schist exposed within a gallery.

Rust-colored bands in a weathered pegmatitic wall within a shallow excavation.

Crosscutting pegmatite vein in gallery wall

Hand sample from pegmatite vein in gallery

Pegmatite vein exposure with internal banding

Pegmatite and schist contact showing textural contrast

Pink saprolite in gallery with biotite and tourmaline patches

UV light showing bright blue fluorescence in a weathered quartz-rich sample.

Layered pegmatitic vein with quartz-feldspar and mica bands

Pink saprolite with tourmaline and biotite traces

葉脈と平行な層流の細いペグマタイト鉱脈

Light-colored clay-altered pegmatite exposed near artisanal workings.

Banding in weathered pegmatitic material inside an artisanal mine

Folded, weathered pegmatitic layering in an artisanal mine

Banded pegmatitic vein with quartz, feldspar, and biotite layers

Cluster of shallow artisanal diggings along a weathered hillside in Novo Cruzeiro.

Collapsed artisanal adit opening on forested slopes at Novo Cruzeiro.

Collapsed artisanal tunnel with pale clay-rich material at the entrance.

Collapsed artisanal tunnel with weathered clay-rich walls near the entrance.

Collapsed artisanal working exposing soft, clay-rich saprolite at Novo Cruzeiro.

Deep, narrow artisanal working in weathered rock near Novo Cruzeiro.

Geologist examines an overgrown artisanal tunnel entrance in the Novo Cruzeiro hills.

Narrow artisanal shaft opening in weathered terrain.

Narrow artisanal tunnel in reddish saprolite at Novo Cruzeiro.

Shallow collapsed entrance of an artisanal working in reddish saprolite.

Steep, narrow tunnel entrance cut by artisanal miners into the Novo Cruzeiro hillside.

Twin artisanal tunnel openings within the Novo Cruzeiro project area.

Vegetation-covered artisanal tunnel concealed within the Novo Cruzeiro hillside.

Weathered face with white clay and feldspar textures

Well-preserved artisanal mine entrance cut into a weathered hillside at Novo Cruzeiro.

Wide artisanal tunnel through reddish-brown saprolite.

ペグマタイトとペグマトイド体

ペグマタイトはスポジュメンを含み、したがってリチウムを含む可能性があります。厚さ、連続性、方向をマッピングして最適なゾーンを特定し、分析で確認します。

Bagged pegmatite samples with coarse biotite, quartz, and feldspar fragments.

Collected pegmatite samples showing coarse mica, quartz, and feldspar fragments.

Dark pegmatite mineral fragments collected from surface exposures.

Close-up of weathered pegmatitic rock with pink feldspar and milky quartz.

Coarse-grained pegmatitic rock with quartz, feldspar, and red garnet crystals.

Contact between dark biotite-rich granite and light pegmatitic material, with hammer for scale.

Deeply weathered pegmatite with clay-rich and iron-stained zones

Field geologist examining oxidized pegmatite with quartz-feldspar banding

Gently dipping outcrop with a light-coloured vein in darker biotite-rich host rock.

Geologist sampling an oxidized saprolite exposure with pale veins

Close view highlighting dark tourmaline clusters within an iron-stained pegmatitic matrix. The red-brown kaolinized textures reflect intense tropical weathering of an originally quartz-feldspar-tourmaline assemblage — typical of lithium-fertile granitic pegmatites. — Hammer-scale view of weathered pegmatite with dark tourmaline and iron-stained zones.

Oxidized exposure showing a banded pegmatitic vein with quartz, feldspar, and muscovite.

Panoramic view of a large weathered pegmatitic exposure within an old open-pit cut.

Pegmatitic vein exposure with quartz-feldspar bands and iron-stained weathering, hammer for scale.

Prominent light-toned pegmatite vein cutting darker country rock along a vertical roadcut face.

Quartz and pegmatite veins in oxidized weathered rock

Quartz vein in weathered granitic wall rock, Novo Cruzeiro area.

Red saprolite exposure with pale weathered pegmatite zones

Weathered exposure showing pegmatite and schist with iron staining and tourmaline relics.

Weathered pegmatite with quartz, feldspar, and iron staining

Weathered pegmatitic face with iron staining and quartz-rich zones in outcrop.

石英、バイオタイト、トルマリンを含むペグマトイド鉱脈

風化したペグマタイト花崗岩サプロライトの露頭

渓流・堆積物サンプル

渓流堆積物には上流の地球化学的特徴が反映されます。Cs、Rb、Taを伴うLi異常は、推定されるペグマタイト起源の追跡に役立ちます。

Granite bedrock exposure along a cascading stream near Novo Cruzeiro.

Field geologist collecting a stream sediment sample below a waterfall cutting through granitic bedrock.

Shaded creek with moss-covered boulders cutting through the forest floor.

小さな滝の特徴を持つ露出した花崗岩ドームを流れる小川。

Stream descending over weathered granite steps within a forest channel.

Geologist inspecting an oxidized drainage channel where surface water interacts with exposed granitic bedrock.

Waterfall exposing granitic bedrock along a forested stream channel.

Field geologist standing beside a shallow oxidized drainage channel cutting through exposed granitic bedrock.

Stream flowing over weathered granite with orange-brown staining.

Small pond beside a weathered red-soil slope near an access trail.

Small drainage channel used for stream sediment sampling in dense forest at Novo Cruzeiro.

Stream channel over weathered granitic bedrock with iron staining and hammer for scale.

Streamside granitic outcrop beside active surface drainage.

Exposed granite dome with shallow drainage and saprolitic weathering at the base.

Exposed granitic bedrock along a shallow creek channel, showing fracture-controlled weathering and sediment transport.

Geologist collecting stream sediment samples from a shallow creek cutting through granitic terrain at Novo Cruzeiro.

Shallow creek flowing over exposed granitic bedrock, suitable for sediment and structural observation.

Stream sediment sample NCZ-SS-0001 collected from a small drainage at Novo Cruzeiro.

Waterfall cutting through granitic basement rock in the Novo Cruzeiro region.

Waterfall partly obscured by forest vegetation along a shaded drainage.

花崗岩システムと母岩

花崗岩質マグマが分化すると、末期の流体からペグマタイトが形成されます。このマグマ・熱水系の流路と鉱化能力を把握することで、大規模な岩体が形成され得る場所を予測します。

Broad granite dome exposure overlooking forested slopes in the Novo Cruzeiro region.

Expansive granitic exposure on a weathered bedrock high near Novo Cruzeiro.

Geologist examining a broad weathered granite exposure with faint pale banding.

細いペグマタイト鉱脈が交差する中等粒性等粒花崗岩

Porphyritic granite with flow fabric and fine pegmatite veins

黒雲母の配向を持つ粗粒等粒性白花崗岩

Granitic outcrop exposure showing subtle mineral banding.

Geologist examining a foliated outcrop with dark biotite-rich bands and surface weathering.

Isolated granitic boulders and domal outcrops across gentle hills

Geologist examining a prominent granite outcrop with light-coloured veins in rolling terrain.

Field geologist examining weathered granite with surface cavities and vegetation cover.

Granite block with multiple fine pegmatite veins

Geologist examining foliated granitic rock with dark and light bands.

Weathered granite outcrop showing sheet-like exfoliation and faint pale vein traces.

Field geologist examining a coarse-grained granite boulder with visible feldspar and quartz.

Fresh coarse-grained granite with feldspar and quartz crystals

Granitic hand sample with quartz-feldspar intergrowths and iron staining.

Coarse-grained granite with thin pegmatite veinlets

Coarse-grained granite with fine garnet grains

Coarse-grained granite with quartz, feldspar, and biotite shown beside a pencil tip.

Coarse-grained granite sample showing feldspar, quartz, biotite, and minor weathering.

Coarse-grained leucogranite with quartz and feldspar

Garnet-bearing granite with coarse quartz, feldspar, and biotite texture.

Hand sample of coarse-grained granite displaying feldspar-rich texture with minor biotite and iron-oxide staining.

Granite exposure with coarse feldspar, quartz, and biotite minerals.

Medium- to coarse-grained granite with visible feldspar, quartz, and biotite.

Freshly exposed granitic surface showing coarse intergrowth of feldspar, quartz, and biotite.

Granitic outcrop showing coarse feldspar and quartz textures exposed at surface, with a rock hammer for scale.

Coarse-grained granite with quartz, feldspar, and dark accessory crystals.

Oxidized granitic outcrop showing iron-stained surface weathering over coarse feldspar and quartz textures.

Granitic outcrop with dark biotite-rich foliation and light quartz-feldspar veinlets.

Coarse-grained granitic outcrop with visible quartz and feldspar.

Weathered granitic outcrop with coarse feldspar crystals

粒状の長石が豊富な花崗岩の近接画像、初期の風化と鉱物の分別が見られます。

機械的な鉛筆の先端に見える粗粒の斑状花崗岩で、長石フェノクリストが暗いバイオタイト–石英の基質の中に散在しています。

Fine- to medium-grained granitic exposure showing dark biotite-rich layering and light felsic mineral bands.

Granite outcrop with aligned feldspar crystals and a field hammer for scale.

Outcrop of dark biotite-rich granite showing foliation and compositional banding.

Porphyritic granite exposure with aligned feldspar phenocrysts, hammer for scale.

Rock hammer on a darkened granitic outcrop showing fracture-controlled oxidation and light surface water flow.

サプロライトと変質帯

熱帯風化によって生じるサプロライトは、硬岩ペグマタイトを覆い隠すことがあります。一方で、地質図作成の手掛かりとなる色や組織の違いが際立つ場合もあります。

High saprolite wall with pink, tan, and cream weathering zones

Geologist sampling reddish-brown residual soil over weathered schist

Geologist sampling a weathered saprolitic exposure showing alternating kaolinite-rich and oxidized bands derived from granitic bedrock.

Roadcut exposure of pink to red saprolitic material in weathered granitic terrain.

Eroded roadcut showing thick saprolitic cover over granitic rock.

Geologist collecting samples from a red clay-rich weathered roadcut.

Red lateritic access road through weathered terrain with small drainage ponds nearby.

Field geologist sampling red-brown lateritic saprolite at Novo Cruzeiro.

Geologist examining a kaolinite-rich saprolitic exposure with distinct bleaching and oxidation zones derived from granitic weathering.

Roadcut exposure with red oxidized saprolite in weathered granitic terrain.

Geologists collecting saprolite samples from a weathered granitic outcrop.

Geologist examining a weathered outcrop with reddish and pale clay-rich zones.

Field examination of a weathered outcrop with iron-rich bands

Roadside exposure of weathered granitic saprolite with pink to red oxidation zones.

Kaolinized granitic saprolite with quartz-rich zones and iron staining.

Yellow-grey saprolite with relict foliation and rock hammer scale

Exposed saprolite face with pink, orange, and pale-yellow weathering bands.

Roadcut exposure of weathered saprolitic material overlying granitic to pegmatitic bedrock.

表土の下に露出した花崗岩–ペグマティックサプロライト

Weathered granite blocks in red saprolitic clay

Weathered outcrop with vertical oxidation bands and clay-rich zones

Roadcut exposure showing deeply weathered pink to red saprolite.

Vertical saprolite wall with pink, yellow, and white weathering zones.

Field sample collected from an oxidized saprolite horizon at Novo Cruzeiro.

Labeled sample bag with kaolinized saprolite from a weathered granitic exposure.

Atlantico field sample NCZ-CR-0001 beside a kaolinized saprolite roadcut.

Field sample NCZ-CR-0004 from weathered granitic saprolite

Fine-grained pale saprolite with kaolinized texture, photographed with a pencil for scale.

Weathered hillside exposure with clay-rich saprolite and embedded coarse rock fragments at Novo Cruzeiro.

Clay-altered saprolite with iron-oxide staining and relict pegmatitic texture.

Close-up of oxidized saprolite with relict granitic textures

Close-up of saprolitic weathering with granular granitic fabric

Dark band exposed within weathered saprolitic material, showing remnant quartz and biotite-rich textures.

Deeply weathered roadcut with layered saprolitic soil over granitic bedrock.

Field hammer beside an iron-stained weathered outcrop with clay-rich zones.

Fine-grained lateritic saprolite with clay-rich matrix and iron oxide mottling.

Iron-oxidized outcrop with clay-rich material and quartz-feldspar textures

Iron-stained saprolite with mottled red and yellow-brown weathering textures.

Iron-stained weathered exposure along a vegetated slope.

Kaolinized and iron-stained saprolite with pink to yellow banding.

Kaolinized and iron-stained saprolite with quartz-feldspar banding

Kaolinized saprolite horizon with pink and white weathering bands.

Kaolinized, iron-stained saprolite with remnant feldspar textures.

Pale kaolinitic layer exposed beneath red-brown lateritic soil.

Pinkish-weathered granitic saprolite with quartz and feldspar relicts

Red-weathered granitic exposure with quartz-rich veinlets and hammer for scale.

鉄分の多い風化の地平線と残存する粘土形成を示す赤褐色のサプロライトプロファイル。

Roadcut exposure of deeply weathered saprolite over granitic rock.

Roadcut exposure of pink to reddish saprolite in weathered granitic rock.

Sharp contact between pale granitic saprolite and red laterite

Vertical roadcut exposure showing kaolinized saprolite with quartz-rich bands and ferruginous staining.

Vertical roadcut showing deeply weathered granitic saprolite with visible textural relics of the parent rock.

Vertical saprolite exposure showing pale and iron-stained weathering layers.

Weathered exposure with red-brown saprolite, pale clay-rich material, and quartz fragments.

Weathered granitic outcrop with kaolinized zones and quartz-feldspar remnants

Weathered granitic saprolite with bleached feldspar and iron staining

Weathered granitic saprolite with bleached feldspar and iron staining

Weathered roadcut with oxidized saprolite and preserved granitic texture.

Weathered saprolite with red and beige clay-rich zones exposed along a roadcut.

Banded weathering pattern in granitic saprolite

Pink schist saprolite with quartz-feldspar veins

Quartz vein exposed in granitic soil

Whitened granitic saprolite with feldspar weathering

Yellow-reddish weathered saprolite horizon

プロジェクト動画 – Novo Cruzeiro

ミナスジェライス州の現地で撮影した短編映像です。プレビューをクリックすると動画を再生できます（動画がない場合は、ポスターをライトボックスで表示します）。

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

プロジェクト現地動画

Historic tunnel entrance cut into the Novo Cruzeiro hillside — one of several man-made passages giving access to mineralized zones.